Bell's theorem and Harrison's (2006) inequality

[DrChinese]

Vanesch, that is a brilliant example. :!)

Talk about both sides of the fence... :rofl:

 

[Maaneli]

There is something highly unethical to talk about detection loopholes or detector efficiency while ignoring some very fundamental aspects and responses to such things.

Unlike most of you, *I* have been involved in actual measurement of such things since the start of my graduate school years, and since about 1 1/2 years ago, have been making high QE photocathodes. So I can talk about background noise, dark current, detector signal, blah blah blah till everyone turns blue. Trying to distinguish between what is "noise" and what is "signal" is a HUGE part of my work. If you look at the raw data from photoemission spectroscopy, for example (i.e. if you make cuts in the data in my avatar), you will see background noise, detector noise, dark currents, etc... Yet, according to SED (and Santos), the these "random" background noise can somehow mimic "actual signal"! NO KIDDING!

How convenient can that be when you can simply stick something in ad hoc, and voila, you can mimic the actual signal simply by burying something in the detector noise. Or did we forget that SED comes with its own set of assumptions about the nature of such background fluctuations? And unlike QM, many of these "assumptions" have not even been tested at the most fundamental level to even see if they are consistent with observation.

Zapper, the stochastic noise isn't really ad-hoc in SED. It is actually derived from the necessary equilibrium condition between fluctuating charges and fluctuating radiation emitted by those charges. In fact, the ZP radiation interacting with these charges is in fact equivalent to the radiation reaction of the classical charges. This is called the fluctuation-dissipation theorem. And the radiation emitted is indeed randomly phased and polarized. For optics, this radiation would actually consitute a background noise with real, physical effects because the zero-point fields are real. Stochastic optics approximates the ZPE radiation as a stochastic noise term with the E and B fields of the noise fluctuating to an average intensity scaled by hf/2. The physical ideas behind SED are discussed concisely on page 3 of this review article by Cole:
http://www.bu.edu/simulation/publica...enCole2005.pdf

And the method by which the stochastic noise is deduced from the Wigner function is found in this article which I already cited:

"What is entanglement?" Emilio Santos.
I conjecture that only those states of light whose Wigner function is positive are real states, and give arguments suggesting that this is not a serious restriction. Hence it follows that the Wigner formalism in quantum optics is capable of interpretation as a classical wave field with the addition of a zeropoint contribution. Thus entanglement between pairs of photons with a common origin occurs because the two light signals have amplitudes and phases, both below and above the zeropoint intensity level, which are correlated with each other.
http://arxiv.org/abs/quant-ph/0204020

But even if you still considered this inadequate, you cannot dismiss the physical consequences of classical fields + stochastic noise. Like Vanesch is emphasizing, it is certainly not just a coincidence that these fundamental tenets of SED explain all the physical phenomena which were the justification for abandoning classical electrodynamics and optics and accepting QM and quantum optics.

Photodetector performance is such a crucial issue, and has been studied so extensively, it is not even funny. Yet, I have seen no actual study done to see how well the detector performance actually matches any of SED's assumption. If we can verify everything from Fowler-Nordheim law at finite temperatures to and the Richardson-Dushman relations for photocathodes, how come this void for SED remains? One would think this is one very fundamental aspect of verification of SED to be taken seriously. Or maybe it is because it is not falsifiable?

However, the most disturbing and unethical aspect of this discussion is the complete void of citation to the TONS of issues that have already been addressed regarding the detection efficiency. All I see are references given to various detection issues that somehow supports SED's point of view on the Bell-type experiments (while ignoring the more stringent CHSH-type experiments). Nowhere was there any mention, by the so-call experts or students in SED, papers such as by S. Massar et al[1] or A. Cabello[2] that have either formulated a Bell-type inequality that are insensitive to detector inefficiency, or that one can distinguish already between quantum optics prediction versus classical with just a detector at 69% efficiency (which we already have!). Or what about Tittel et al.[3] experiment that analyzed their data without subtracting any accidental coincidences (something that many have claimed would reveal "non-quantum" results)?

Where are the rebuttals from the SED camp to those papers? Check any of Santos or Marshall's published papers and citations to their papers that addressed many of the issues that they brought up. So how come they did not address any of these? And I only did a very quick search on a few papers that I am aware of. The rest of you who, I presumed, work in this field or very much interested in it, should have a truckload of literature that you are sitting on. So why were these types of papers that have addressed such detector issues WITHHELD from being listed here alongside those that were so quickly advertized?

There are more of these type of papers. This is why I find such omission here very disturbing. It somehow conveys that the issues brought up by SED are "unanswerable" and thus, must be true. If you omitted such on info on purpose, then shame on you. If you simply were ignorant of all of these large bodies of information, then what else have you missed that you SHOULD have known before pushing this thing onto us?

Zz.

[1]S. Massar et al. PRA 66, 052112 (2002).
[2] A. Cabello PRA 72, 050101 (2005).
[3] W. Tittle et al. PRL 81, 3563 (1998).

As has already been mentioned, in SED there are some preliminary ideas for theories of detection and how detectors work. I also already cited these papers by Santos. But keep in mind that though SED has not completely addressed detection theory, it must be qualified that it was only until 2002 that the stochastic optics formalism was completed to account for all the optical tests of Bell's theorem. Moreover, Marshall has since retired from the field due to his health, thus making Santos essentially the only one actively working in the field. And both men are in their early 70's. So progress along the lines of formulating a theory of detection will understandably be very slow, until there is young blood in this field.

Regarding those detection efficiency papers you mentioned, while I was unaware of the papers you cited, the test requiring the 69% efficiency is not relevant to stochastic optics. To refute SO requires detection efficiencies >87%. Moreover, that paper does not reference stochastic optics at all. I don't know the details of Tittel's paper.Massar's proposal may have been misunderstood by you. I just did an arxiv search under his name and found an even more recent paper than the one you cite, in which he says the following:

Violation of local realism vs detection efficiency (2003) Serge Massar, Stefano Pironio
"We put bounds on the minimum detection efficiency necessary to violate local realism in Bell experiments. These bounds depends of simple parameters like the number of measurement settings or the dimensionality of the entangled quantum state. We derive them by constructing explicit local-hidden variable models which reproduce the quantum correlations for sufficiently small detectors efficiency."
http://lanl.arxiv.org/abs/quant-ph/0210103

So, these resistances to detector efficiencies put bounds on the validity of the LHV's that Massar et al. constructed. They do not make any reference to any of Santos or Marshall's work. Moreover, the LHV model Massar constructs is clearly not the same as Santos and Marshall's. So we don't know how or even if these detector efficiency bounds apply to stochastic optics.

Furthermore, I think all those papers are also undercut by the fact that in his 2006 FQX grant abstract, Kwiat still acknowledges that in the proposed "loop-hole free" test, "The greatest technical challenge for this experiment will be closing the detection loophole by exceeding the approximately 70% limit for total photon-detection efficiency".

It's important to understand that papers in this field of semiclassical approaches to optics and QM are fairly scattered. It is very difficult to be an expert in the work of Santos and Marshall, whose publications span 15 years, and to also be aware of every possible spin-off or criticism of their work since then. So no one - at least not me - is withholding information. Not being aware of every single publication ever in this field, or not being able to answer every single criticism posed, does not at all imply that SED can't answer these questions. It just hasn't been given the time or man power to address them.

 

[Careful]

***
Experimental violation of a Bell's inequality with efficient detection

M. A. ROWE, D. KIELPINSKI, V. MEYER, C. A. SACKETT, W. M. ITANO, C. MONROE & D. J. WINELAND (Nature, 2001)

Abstract:
Local realism is the idea that objects have definite properties whether or not they are measured, and that measurements of these properties are not affected by events taking place sufficiently far away. Einstein, Podolsky and Rosen used these reasonable assumptions to conclude that quantum mechanics is incomplete. Starting in 1965, Bell and others constructed mathematical inequalities whereby experimental tests could distinguish between quantum mechanics and local realistic theories. Many experiments have since been done that are consistent with quantum mechanics and inconsistent with local realism. But these conclusions remain the subject of considerable interest and debate, and experiments are still being refined to overcome 'loopholes' that might allow a local realistic interpretation. Here we have measured correlations in the classical properties of massive entangled particles (9Be+ ions): these correlations violate a form of Bell's inequality. Our measured value of the appropriate Bell's 'signal' is 2.25 +/- 0.03, whereas a value of 2 is the maximum allowed by local realistic theories of nature. In contrast to previous measurements with massive particles, this violation of Bell's inequality was obtained by use of a complete set of measurements. Moreover, the high detection efficiency of our apparatus eliminates the so-called 'detection' loophole.
***

I thought that one did not close the locality loophole (the two detectors were too close to each other). Anyway, both loopholes seem to be interconnected. But I am still waiting for your response how efficient photon and electron detectors work (I am just curious). Perhaps Zapperz can provide an explanation for us for say an electron detector (I promise not to turn blue) ?!

Careful

 

[Maaneli]

To Zz's point: Call it for what it is... SED is a speculative work-in-progress that has yet to yield a single useful discovery. In the meantime:

Experimental violation of a Bell's inequality with efficient detection

M. A. ROWE, D. KIELPINSKI, V. MEYER, C. A. SACKETT, W. M. ITANO, C. MONROE & D. J. WINELAND (Nature, 2001)

Abstract:
Local realism is the idea that objects have definite properties whether or not they are measured, and that measurements of these properties are not affected by events taking place sufficiently far away. Einstein, Podolsky and Rosen used these reasonable assumptions to conclude that quantum mechanics is incomplete. Starting in 1965, Bell and others constructed mathematical inequalities whereby experimental tests could distinguish between quantum mechanics and local realistic theories. Many experiments have since been done that are consistent with quantum mechanics and inconsistent with local realism. But these conclusions remain the subject of considerable interest and debate, and experiments are still being refined to overcome 'loopholes' that might allow a local realistic interpretation. Here we have measured correlations in the classical properties of massive entangled particles (9Be+ ions): these correlations violate a form of Bell's inequality. Our measured value of the appropriate Bell's 'signal' is 2.25 +/- 0.03, whereas a value of 2 is the maximum allowed by local realistic theories of nature. In contrast to previous measurements with massive particles, this violation of Bell's inequality was obtained by use of a complete set of measurements. Moreover, the high detection efficiency of our apparatus eliminates the so-called 'detection' loophole.

To Vanesch's analogy (with thermodynamics): We are being asked to accept that "noise" accounts for violation of Bell Inequalities. Yet regardless of detector efficiency, the results are the same! Aspect's early inefficient tests yield almost precisely the same results as the later, more refined tests (as compared to the predictions of QM). Where is the movement towards the SED predicted values you might expect when visibility increases?

And to anyone who is actually in SED's court: If Malus' Law does not hold, please answer the following question: What are the values for the coincidence rate at 0, 22.5 and 45 degress (as compared to the cos^2 function from both classical optics and QM)? A specific value, so we have something to discuss... after all, it can't match QM without running afoul of Bell...

DrChinese, I recall that the answer to your questions about Malus' Law are given in the paper by Marshall and Santos that I asked you to read:

Stochastic optics: A local realistic analysis of optical tests of Bell inequalities
http://prola.aps.org/abstract/PRA/v39/i12/p6271_1

I don't have full access to PROLA from my computer, but hopefully you do. The answers are in there.

Also, if stochastic optics is fundamentally correct, then it is not at all surprising why Aspects experimental results are the same as current one's. I don't see the beef here.

Moreover, the paper you cited does not apply to SO, as I had already mentioned that the theory has not yet been applied to electrons, let alone ions. But even then, you should probably know that that paper you cite is also no longer considered a valid test of local realism because the two subsystems (the two ions) were not really separated systems during measurement and so the test cannot be considered a real implementation of a detection loophole-free test of Bell inequalities, even if it represents a relevant progress in this sense. Ands this is a conclusion confirmed in personal correspondences with Kwiat and Genovese.

~M

 

[DrChinese]

1. Moreover, the paper you cited does not apply to SO, as I had already mentioned that the theory has not yet been applied to electrons, let alone ions.

2. But even then, you should probably know that that paper you cite is also no longer considered a valid test of local realism because the two subsystems (the two ions) were not really separated systems during measurement and so the test cannot be considered a real implementation of a detection loophole-free test of Bell inequalities, even if it represents a relevant progress in this sense. Ands this is a conclusion confirmed in personal correspondences with Kwiat and Genovese.

1. Glad to know that only photons are local realistic. :rofl:

2. This is a valid experiment which closes the detection loophole. They do not claim that strict einsteinian locality is maintained. If you already believe in local reality, then requiring spacelike separation isn't relevant to the detection issue. (Think about it...)

 

[DrChinese]

1. I thought that one did not close the locality loophole (the two detectors were too close to each other).

2. Perhaps Zapperz can provide an explanation for us for say an electron detector (I promise not to turn blue) ?!

Careful

1. Why would a local realist raise this objection? I can see why ttn might, but that doesn't quite make sense from you.

2. Why do you keep raising this issue? If you have a point to make, say it! You can google this info as fast as anyone.

 

[ZapperZ]

Zapper, the stochastic noise isn't really ad-hoc in SED.

"What is entanglement?" Emilio Santos.
I conjecture that only those states of light whose Wigner function is positive are real states, and give arguments suggesting that this is not a serious restriction.

How could you not say these are not ad hoc, and then quote what is clearly a "shove-in-by-hand" conjecture?

But even if you still considered this inadequate, you cannot dismiss the physical consequences of classical fields + stochastic noise. Like Vanesch is emphasizing, it is certainly not just a coincidence that these fundamental tenets of SED explain all the physical phenomena which were the justification for abandoning classical electrodynamics and optics and accepting QM and quantum optics.

But you're willing to somehow consider it is purely a coincidence that ALL of the Bell-type, CHSH-type, and GHZ-type experiments are violated.

As has already been mentioned, in SED there are some preliminary ideas for theories of detection and how detectors work. I also already cited these papers by Santos. But keep in mind that though SED has not completely addressed detection theory, it must be qualified that it was only until 2002 that the stochastic optics formalism was completed to account for all the optical tests of Bell's theorem. Moreover, Marshall has since retired from the field due to his health, thus making Santos essentially the only one actively working in the field. And both men are in their early 70's. So progress along the lines of formulating a theory of detection will understandably be very slow, until there is young blood in this field.

Then people who are trumpting its horns are putting the care WAY before the horse, like maybe in the next county. SED has a serious shortcoming of verifying the most fundamental aspect of what it is predicting at the detector level. Those of us who depend on a detector detecting VALID signals are amazed that one could get something that is nothing more than background noise to mimick a real signal. If you truly think that is true, then stop using your modern electronics, because the band structures of many semiconductors that we verified using photoemission obviously are WRONG.

This is why I asked for SED to spew out an agreement to ARPES, etc. If you cannot produce something that is the CLOSEST to the fundamental level of your theory, how do you know that all those you build on top of are valid?

Regarding those detection efficiency papers you mentioned, while I was unaware of the papers you cited, the test requiring the 69% efficiency is not relevant to stochastic optics. To refute SO requires detection efficiencies >87%. Moreover, that paper does not reference stochastic optics at all. I don't know the details of Tittel's paper.Massar's proposal may have been misunderstood by you. I just did an arxiv search under his name and found an even more recent paper than the one you cite, in which he says the following:

Violation of local realism vs detection efficiency (2003) Serge Massar, Stefano Pironio
"We put bounds on the minimum detection efficiency necessary to violate local realism in Bell experiments. These bounds depends of simple parameters like the number of measurement settings or the dimensionality of the entangled quantum state. We derive them by constructing explicit local-hidden variable models which reproduce the quantum correlations for sufficiently small detectors efficiency."
http://lanl.arxiv.org/abs/quant-ph/0210103

So, these resistances to detector efficiencies put bounds on the validity of the LHV's that Massar et al. constructed. They do not make any reference to any of Santos or Marshall's work.

Look at the paper *I* cited. They cited Santos's work. I also want to let you know that I would rather be given the published version of a paper, and not the arxiv reference - unless of course you don't want me to do a citation index search on these things.

It's important to understand that papers in this field of semiclassical approaches to optics and QM are fairly scattered. It is very difficult to be an expert in the work of Santos and Marshall, whose publications span 15 years, and to also be aware of every possible spin-off or criticism of their work since then. So no one - at least not me - is withholding information. Not being aware of every single publication ever in this field, or not being able to answer every single criticism posed, does not at all imply that SED can't answer these questions. It just hasn't been given the time or man power to address them.

I strongly disagree. I came from the high-Tc superconductivity field in which the number of papers being published PER WEEK exceeds many fields in a year! And I don't want to put this field down, but I bet you the frequency of papers published in this field is miniscule when compared with condensed matter. So your excuse of not knowing the existence of such-and-such a paper rings hollow in my book, especially earlier when you pleaded ignorance of GHZ experiments. All I did today was do a quick citation index on one of Santos's papers and out comes several other citations. If someone who isn't an "expert" in this field and have only followed it closely as an interested party can obtain such references, how difficult can this be?

Zz

 

[Maaneli]

1. Glad to know that only photons are local realistic.

2. This is a valid experiment which closes the detection loophole. They do not claim that strict einsteinian locality is maintained. If you already believe in local reality, then requiring spacelike separation isn't relevant to the detection issue. (Think about it...)

To the first point, haha your so funny. Again, just wait until SO can be extended to fermions. You can't say only photons are local realistic just because the formalism has not been applied to massive particles. You just simply have to be agnostic on the latter.

To the second point, you can't be serious . If the ions are not separate systems, then it is even easier to suggest local causal influences between the ions. I agree that complete spacelike separation isn't relevant to confirming local reality - which is how a local realist would interpret all these experiments, since they still agree with certain LHV models. However, it is obviously a necessary (though not sufficient) condition for testing the existence of nonlocal reality, if it really does exist.

~M

 

[Maaneli]

How could you not say these are not ad hoc, and then quote what is clearly a "shove-in-by-hand" conjecture?

The ZPE from SED is not ad-hoc as I have already shown. The stochastic optical approximation of the ZP radiation in SED as noise, may be considered somewhat ad-hoc. But there are degrees of arbitrariness in a theory. This is clearly discussed in the review article I cited, and this earlier paper:

Stochastic optics: A local realistic analysis of optical tests of Bell inequalities
http://prola.aps.org/abstract/PRA/v39/i12/p6271_1

What Santos does in his 'Entanglement' paper is first give various arguments for why all real states of light have a positive Wigner function. He then show trivially how one can interpret that function as an actual probability distribution of the amplitudes of
the radiation modes. Thus quantum optics becomes a disguised stochastic theory, where the states of light are probability distributions defined on the set of possible realizations of the electromagnetic field. He then goes to say,

"We propose the name stochastic optics for the stochastic interpretation of quantum optics derived from the Wigner function. From another point of view, the stochastic interpretation provides an explicit hidden variables theory where the amplitudes of the electromagnetic field are the ”hidden” variables!. The most dramatic consequence of stochastic optics is that the vacuum is no longer empty, but filled with a random electromagnetic radiation having an energy hf/2 per radiation mode, on the average, as is shown ineq.(5). That radiation corresponds precisely to the additional term introduced by Max Planck in his second radiation law (see e.g. ). The picture that emerges is that space contains a random background of electromagnetic waves providing what we shall call a zeropoint field (ZPF)."

To me this is not very ad-hoc. Starting with this defendable argument that all real states of light have a positive Wigner function, everything else follows. Of course, don't take my word for it. Read the paper.

http://arxiv.org/abs/quant-ph/0204020

But you're willing to somehow consider it is purely a coincidence that ALL of the Bell-type, CHSH-type, and GHZ-type experiments are violated.

I don't understand this sentence. I am willing to consider the possibility that all of these experiments are consistent with local hidden variables that also violate the inequalities. In fact these inequalities describe a specific class of LHV's which are violated. And there are different classes of LHV's, such as stochastic optics, that also violate those inequalities. So if LHV's are fundamental, and QM is an accurate approximation of these inequality violating LHV's, then it is pefectly reasonable why these experiments violate the said inequalities. I don't see how that makes me consider these experiments to be a coincidence.

Then people who are trumpting its horns are putting the care WAY before the horse, like maybe in the next county. SED has a serious shortcoming of verifying the most fundamental aspect of what it is predicting at the detector level. Those of us who depend on a detector detecting VALID signals are amazed that one could get something that is nothing more than background noise to mimick a real signal. If you truly think that is true, then stop using your modern electronics, because the band structures of many semiconductors that we verified using photoemission obviously are WRONG.

This is why I asked for SED to spew out an agreement to ARPES, etc. If you cannot produce something that is the CLOSEST to the fundamental level of your theory, how do you know that all those you build on top of are valid?

SED and SO theorists know that what they build on top is valid simply because it works, meaning that to the extent that SED and SO have been analyzed and applied, they have been as successful as QM in making predictions consistent with current experiments. And it is these approaches which the SED theorists build upon. Now by no means does that guarantee that the current approach of SED will continue to be successful. In fact, I am willing to bet that for SED to develop an accurate theory of detection and atomic band structure, it will have to be modified in some way, or some ingenious new approach to problem the will have to be developed. Now I could give you my thoughts on precisely how one could do this, but I suspect that would only be suitable for the independent research forum. Nevertheless, I think SED and SO's current success are good enough to build upon.

Look at the paper *I* cited. They cited Santos's work. I also want to let you know that I would rather be given the published version of a paper, and not the arxiv reference - unless of course you don't want me to do a citation index search on these things.

The paper you cited cites only one paper by Santos, and it is along with two other citations in the context of just completing the solution to an equation. Moreover, that paper is from 1992. The complete stochastic optical formalism based on Wigner functions was developed from 1996-2002. Also, in that paper, there is no reference to the term stochastic optics. It is not enough to just see the citation by Santos. You have to know in what context it is used and how old it is in relation to others papers by the same author.

Also, I gave the arxiv reference because it was full access and I don't know if you have full access to PROLA. Moreover, if the paper is published, it would say so and in which journal, on the arxiv reference. In fact, here it is.
http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PLRAAN000068000006062109000001&idtype=cvips&gifs=yes

I strongly disagree. I came from the high-Tc superconductivity field in which the number of papers being published PER WEEK exceeds many fields in a year! And I don't want to put this field down, but I bet you the frequency of papers published in this field is miniscule when compared with condensed matter. So your excuse of not knowing the existence of such-and-such a paper rings hollow in my book, especially earlier when you pleaded ignorance of GHZ experiments. All I did today was do a quick citation index on one of Santos's papers and out comes several other citations. If someone who isn't an "expert" in this field and have only followed it closely as an interested party can obtain such references, how difficult can this be?

Zz

That's true that your field has more publications per week than any other field. However, I would guess that even then you don't have the time to read every paper and even for those you do read, my guess is that you are not an expert on them. Or, at least it takes some time to become an expert. Also, you are a professional working CM physicist who's job it is to read these papers. And you seem to have been doing this for at least 20 years. I on the other hand am still a full-time physics student and have only seriously entered this field of theoretical and experimental quantum and stochastic optics in the past year. And I don't want to have a trivial knowledge of every publication in the field. I am taking the time to study the Marshall and Santos papers carefully. So you can see the situation is different.

~M

 

[DrChinese]

To the second point, you can't be serious . If the ions are not separate systems, then it is even easier to suggest local causal influences between the ions...

Now you are being funny.

QM needs nothing else to fill in the blanks, and neither would an explicit non-local theory such as Bohmian Mechanics (nor MWI for that matter). A local realistic theory would! There would need to be a previously unknown force or causal agent. And that, my friend, should be detectable using conventional means. And they would CERTAINLY need to be explicitly present in SED to explain this experiment.

So throw out the experimental results that bother you, and sleep tight tonight.

 

[Maaneli]

Now you are being funny.

QM needs nothing else to fill in the blanks, and neither would an explicit non-local theory such as Bohmian Mechanics (nor MWI for that matter). A local realistic theory would! There would need to be a previously unknown force or causal agent. And that, my friend, should be detectable using conventional means. And they would CERTAINLY need to be explicitly present in SED to explain this experiment.

So throw out the experimental results that bother you, and sleep tight tonight.

There is a causal agent. I'm not sure what you mean by conventional means, but SO does show you how to test for it experimentally. I have already cited the papers on this thread proposing such experiments.

Also, you should realize that your opinion of that experiment you cited contradicts the opinions of specialists in the field such as Kwiat.

~M

 

[DrChinese]

I don't understand this sentence. I am willing to consider the possibility that all of these experiments are consistent with local hidden variables that also violate the inequalities. In fact these inequalities describe a specific class of LHV's which are violated. And there are different classes of LHV's, such as stochastic optics, that also violate those inequalities. So if LHV's are fundamental, and QM is an accurate approximation of these inequality violating LHV's, then it is pefectly reasonable why these experiments violate the said inequalities. I don't see how that makes me consider these experiments to be a coincidence.

The reason he said ALL is that there are many types of tests, including particles other than light. And there are many permutations, some including 3, 4 and more particles. And yet ALL of the results are exactly in keeping with the predictions of QM. Quantum erasers, where is the noise there?

Zz points out that the world of applied physics is so much larger, you must make a conclusion based on the weight of ALL of the evidence; and not just based on a small fraction.

Sure, some of the arguments of SED might have had some merit back in the late 70's/early 80's when the Bell tests were getting going. But today, SED has been left in the dust relative to the subject of local realism. This is because QM makes specific predictions about a wide range of behaviors, those predictions have been tested, and QM was not falsified (as it could have been) in the process. That is good science.

 

[ZapperZ]

I don't understand this sentence. I am willing to consider the possibility that all of these experiments are consistent with local hidden variables that also violate the inequalities. In fact these inequalities describe a specific class of LHV's which are violated.

You have no ability to say that (no SED proponent can) when you haven't shown how CHSH and GHZ experiments agree with SED. Even Santos haven't made that claim!

SED and SO theorists know that what they build on top is valid simply because it works, meaning that to the extent that SED and SO have been analyzed and applied, they have been as successful as QM in making predictions consistent with current experiments. And it is these approaches which the SED theorists build upon. Now by no means does that guarantee that the current approach of SED will continue to be successful. In fact, I am willing to bet that for SED to develop an accurate theory of detection and atomic band structure, it will have to be modified in some way, or some ingenious new approach to problem the will have to be developed. Now I could give you my thoughts on precisely how one could do this, but I suspect that would only be suitable for the independent research forum. Nevertheless, I think SED and SO's current success are good enough to build upon.

Then go ahead and build on top of them. But until you have gone back to the fundamental pillars and verify that they are valid, all you have is simply a phenomenological theory.

Look at what is happening to QM. Even with all its successes, we STILL tests its fundamental building blocks, such as the superposition principle. This is what the Stony Brook/Delft experiements were designed to test. I've been asking SED proponents for YEARS to show me ONE complete simulation of a typical photoemission spectroscopy result. Just ONE. This will truly test of the fundamental assumptions of SED in regards to how photons interact with a material to produce an electrical signal, AND, that signal can, in turn, tells us something about the material itself!

This is such at the most fundamental and basic level that I don't understand why SED people don't just jump into it. Success in it means that you have a whole bunch of condensed matter physicists paying a closer attention to what you have to say!

That's true that your field has more publications per week than any other field. However, I would guess that even then you don't have the time to read every paper and even for those you do read, my guess is that you are not an expert on them.

At the very least, I'm AWARE of them, and if the same subject came up, I would have remembered reading something about it. I certainly would not have withheld information on it even it was contrary to what I was going to present.

Or, at least it takes some time to become an expert. Also, you are a professional working CM physicist who's job it is to read these papers. And you seem to have been doing this for at least 20 years. I on the other hand am still a full-time physics student and have only seriously entered this field of theoretical and experimental quantum and stochastic optics in the past year. And I don't want to have a trivial knowledge of every publication in the field.

I find that rather incredulous. I mean, GHZ papers are "trivial knowledge"? I pay attention to everything that Zeilinger publishes, and I'm not even in the SAME field! I mean, this guy could get the Nobel Prize some time in my lifetime. I would hardly think that such a paper, appearing in PRL and Nature no less, would be considered as "trivial knowledge".

Zz.

 

[Maaneli]

You have no ability to say that (no SED proponent can) when you haven't shown how CHSH and GHZ experiments agree with SED. Even Santos haven't made that claim!

I don't know what Santos and Marshall think of the CHSH and GHZ experiments, but I have dispatched an e-mail asking them.

Look at what is happening to QM. Even with all its successes, we STILL tests its fundamental building blocks, such as the superposition principle. This is what the Stony Brook/Delft experiements were designed to test. I've been asking SED proponents for YEARS to show me ONE complete simulation of a typical photoemission spectroscopy result. Just ONE. This will truly test of the fundamental assumptions of SED in regards to how photons interact with a material to produce an electrical signal, AND, that signal can, in turn, tells us something about the material itself!

This is such at the most fundamental and basic level that I don't understand why SED people don't just jump into it. Success in it means that you have a whole bunch of condensed matter physicists paying a closer attention to what you have to say!

If photoemission spectroscopy would be that convincing to CM physicists, then maybe you're right. Maybe that is a good place for SED theorists to focus one's energy. As of right now, efforts are fairly scattered. As an example, there was an SED conference back in 2001. Read the subjects of talks given:
http://www.bu.edu/simulation/conferences.html

At the very least, I'm AWARE of them, and if the same subject came up, I would have remembered reading something about it. I certainly would not have withheld information on it even it was contrary to what I was going to present.

Well now I know about the GHZ experiments. Keep in mind that Vanesch was aware of the inequality, but not aware of the experiments, and he is also interested in SED and quantum optics, the latter probably longer than I have. Also, I hope your not implying that I intentionally withheld information.

I find that rather incredulous. I mean, GHZ papers are "trivial knowledge"? I pay attention to everything that Zeilinger publishes, and I'm not even in the SAME field! I mean, this guy could get the Nobel Prize some time in my lifetime. I would hardly think that such a paper, appearing in PRL and Nature no less, would be considered as "trivial knowledge".

Zz.

Well my efforts and attention have also been focused elsewhere. You may pay attention to everything Zeilinger publishes, but you are also clearly very ignorant of Santos and Marshall's papers and theories. So there is always a tradeoff in one's "awareness". And once again, I have only seriously become interested in this field in the past year, where I initially started from the very basics of classical optics and Bell's theorem. You can't start from the most advanced and cutting-edge information about the field, when you are just starting out, even if it is "trivial knowledge". I don't think this is a trivial feat for a full-time physics student who is still taking courses, and is still conducting experimental research on single-bubble sonoluminescence, in parallel with research on foundations of QM and quantum optics.

~M

 

[QuantunEnigma]

Gordon
(Or as you call yourself: MW, Mostly Wrong, QuantunEnigma, any more?)

Oh please, you think your a “Rich Thinker”
In post #66 you ask DrC for a negative probability example when he has already given you just that in his link that you quoted back to him!

On Aug 20 your site had only one working page with links to dozens of THIS PAGE DOWN BEING WORKED on links. That hardly counts as “many pages”,

On Aug 21 you put up about a dozen more pages, but any chance you might document your claim the “Bell Logic is false” in your explanations of your versions of W ‘locality’ and ‘factoring’ is still buried behind “This Page Down” links.
Then on the 22nd rather than use your MW id you created the extra QuantunEnigma id to lure DrC and others to your site.

That’s not rich thinking – that’s baiting and dishonest.
You owe both DrC and Zz an apology.

Gordon says he is committed to returning as soon as he has "revised one large page with appendages. He says the new site was converted from the old one on 12 August. Factoring etc was up on the old site for years which contained more than 2Mb."

You are so emotional obsessed about "Gordon" why do you not give him a phonecall. Like me you have or can get his number easily and it might make you more healthy in your poor mind.

I did not refer to myself as a rich thinker but I see you understand the other person addressed.

I am not a mouthpiece for WM and i do not think you are a mouthpiece for drChinese. So speak for yourself about an experiment that proves negative probabilities. What a joke. Did they come out with negative relative frequencies?

If not then you know the secret address where drChinese example is discussed and done over i believe? (What date did you see it?) So stop hiding behing the gurus and think for yourself unless you think that science is like religion and facts do not matter any more?

I forgot to say about your [Q]Then on the 22nd rather than use your MW id you created the extra QuantunEnigma id to lure DrC and others to your site.[/Q] I told you it was a mistake. And there is no money to be made at the site so why would anyone want to lure anyone there?

Hope you soon reply with more about the proof of negative probabilities.

 

[Careful]

**
2. Why do you keep raising this issue? If you have a point to make, say it! You can google this info as fast as anyone. **

Well, YOU keep on saying that detector efficiency cannot possibly be a fundamental thing. I, on the other hand, think the arguments of Santos and Marshall are cleverly done. Since I am theorist, I only remember some old photon/electron (the ``bubble'' chamber) detectors which we studied at university during the first two years (and like Maaneli, I think it is better to think deep about fewer topics than to read about them all.). So all I am asking here is how one can be sure that if one detects a signal, it corresponds to only one electron scattering off the apparatus ? Or, when no detection is made, no electron is passing ? I guess one should also take into account electrons being annihilated in the apparatus ... So, it is a reasonable question with interest for many I guess... (perhaps Vanesch, who plays with detectors a lot can give some answer ?)

EDIT : clearly the detector efficiency depends upon the distance between source and the latter if one does not think of particles or photons as bullet like objects (clearly also on the wavelength ...).

Careful

 

[DrChinese]

So all I am asking here is how one can be sure that if one detects a signal, it corresponds to only one electron scattering off the apparatus ? Or, when no detection is made, no electron is passing ?

I cannot say as certainly for electrons, but for photons this issue has been well addressed. This is an issue that has banged around a while in the Local Realist group, which is why I was asking to understand your point.

Detector manufacturers use entangled photons as a technique to calibrate their detectors to an extremely high rate of accuracy. I don't have the figures for a specific manufacturer in front of me, but it is high and addresses your question exactly: a detection matches one photon, no detection matches no photon. The basic concept can be seen in studies like the following:

http://marcus.whitman.edu/~beckmk/QM/grangier/Thorn_ajp.pdf J. J. Thorn, M. S. Neel, V. W. Donato, G. S. Bergreen, R. E. Davies, and M. Becka)

"Here we present an experiment, suitable for an undergraduate laboratory, that unequivocally demonstrates the quantum nature of light. Spontaneously downconverted light is incident on a beamsplitter and the outputs are monitored with single-photon counting detectors. We observe a near absence of coincidence counts between the two detectors—a result inconsistent with a classical wave model of light, but consistent with a quantum description in which individual photons are incident on the beamsplitter. More explicitly, we measured the degree of second-order coherence between the outputs to be g(2)(0)50.01776 +/- 0.0026, which violates the classical inequality g(2)(0)>1 by 377 standard deviations."

I am certain that Santos is familiar with these type experiments, but chooses to reject the results. However, the combination of these experiments with detector efficiency tests are quite convincing to anyone who reads them. I will look for some information from one of the manufacturers. Zz may be able to add something on this as well.

Edit to add: the Perkin Elmer model SPCM-AQR-13-FC (Single Photon Mutilplier detector) was used and it has a dark count rate of less than 250 per second. The experiments were conducted with over 7000 coincidences per second by way of comparison.

 

[RandallB]

I told you it was a mistake.

If you can show me where you admitted to making a mistake in intentionally playing tag team with MW on this thread to promote his website (“I didn’t know” is a 5 yr olds excuse not an admission of error or apology) then I acknowledge that as an apology, but I don’t find anything like that in your posts.

an experiment that proves negative probabilities ……… Did they come out with negative relative frequencies? ……. you know the secret address where DrC example is

Where did you see a claim that experiment produces negative probability counts (frequencies?) that is a calculation from using the Bell Theorem.
And what secret address? - you quoted it in your post #66;
follow his reference links if you don’t like DrC’s short version.

stop hiding behind the gurus and think for yourself unless you think that science is like religion and facts do not matter any more?

What gurus, is that what you consider to MW to be? I’ve shared with the people that count on here where my position disagrees with theirs but I don’t demand anyone accept or listen to my ideas until I have find a real way to support them.

Fact is it is you and MW that demand to be listen to, just for claiming Bell Logic is Wrong or ‘Silly”.
MW claims to have documented it for years but has been unable to cut and paste a single relevant word or fact supporting such a huge claim (religion?) anywhere I can find.
Gordon was asked to “show the beef” on this two years ago – tell him to put it on his website not here – if it is more than a little Chicken or Turkey on the bun, maybe I’ll find it. The two of you have done more than enough to destroy your own credibility to justify posting here.

Yet you claim a success in post #66 in hooking one person to take the time to vainly search for a straight answer on MW’s web site;
and then insult me and my “poor mind”, for doing so.
So this is my last response to you as if you keep this up you are Zz’s problem anyway – he does a needed and good job at keeping this overall forum rational and is more than fair. (By the way, Thanks Zz for what you do for the group that goes unseen)

 

[QuantunEnigma]

If you can show me where you admitted to making a mistake in intentionally playing tag team with MW on this thread to promote his website (“I didn’t know” is a 5 yr olds excuse not an admission of error or apology) then I acknowledge that as an apology, but I don’t find anything like that in your posts.

Where did you see a claim that experiment produces negative probability counts (frequencies?) that is a calculation from using the Bell Theorem.
And what secret address? - you quoted it in your post #66;
follow his reference links if you don’t like DrC’s short version.
What gurus, is that what you consider to MW to be? I’ve shared with the people that count on here where my position disagrees with theirs but I don’t demand anyone accept or listen to my ideas until I have find a real way to support them.

Fact is it is you and MW that demand to be listen to, just for claiming Bell Logic is Wrong or ‘Silly”.
MW claims to have documented it for years but has been unable to cut and paste a single relevant word or fact supporting such a huge claim (religion?) anywhere I can find.
Gordon was asked to “show the beef” on this two years ago – tell him to put it on his website not here – if it is more than a little Chicken or Turkey on the bun, maybe I’ll find it. The two of you have done more than enough to destroy your own credibility to justify posting here.

Yet you claim a success in post #66 in hooking one person to take the time to vainly search for a straight answer on MW’s web site;
and then insult me and my “poor mind”, for doing so.
So this is my last response to you as if you keep this up you are Zz’s problem anyway – he does a needed and good job at keeping this overall forum rational and is more than fair. (By the way, Thanks Zz for what you do for the group that goes unseen)

I thank all of the group for their contributions. They are the gurus that i meant and not MW or the way you are drChinese mouthpiece sometimes. You do not hide behind MW so he is not the guru I was talking about. And I see our correspondence is ruining the flow so I am closing down on this subject out of my depth ...

I thought I said that I made a mistake somewhere - for which I am always sorry ... so I have no problem to saying sorry again to everyone. You will learn that 25 year and 75 olda makes mistakes also.

Also I knew what SED was and I hope you will learn also that your different words about "proof of negative" probability is different from "experimental proof of negative probabilities".

The secret site is the one that you and i are monitoring, that is all. The one that cannot be mentioned like this [SPAM link removed - the NEXT time I have to do this, you're gone! - Zz.] because I do not know how to make it a hidden legal link to show what we are talking about. If you would show me how please I would edit this posting and leave in peace.

And i could have not put it in number 66 because i did not know then how either. Are you mistaking may be it for another address. I will look at number 66 again.

 

[ZapperZ]

because I do not know how to make it a hidden legal link to show what we are talking about.

Re-read the Guidelines that you have agreed to. Personal, unverified theories and ideas are NOT allowed. If you have a personal theory to push, do so in the IR forum. You have been told this before, and I very seldom repeat what has been said.

Furthermore, citation to some website does NOT strengthen your case! So stop doing that. This is not how science, and especially physics, is done. If you think you have a valid idea, cite a respected peer-reviewed journal.

I expect that this is the last time I have to explain this.

Zz.

 

[Farsight]

Thanks for that link, DrChinese.

 

[Careful]

***
Detector manufacturers use entangled photons as a technique to calibrate their detectors to an extremely high rate of accuracy. I don't have the figures for a specific manufacturer in front of me, but it is high and addresses your question exactly: a detection matches one photon, no detection matches no photon. The basic concept can be seen in studies like the following: ****

No, no, detection efficiency depends on the frequency of light, distance to the source and so on... Sudarsan and Glauber have studied this in the sixties, you cannot obtain (even in QFT) a genuine violation of the Bell inequalities with optical light (this is also a point Santos makes) - so your manufacturer probably has some more detailed information in small print in the booklet of the apparatus. Now, for solid particles (like electrons or kaons), it appears to me you can make probability of detection extremely high (for example by bombarding the electrons with high frequency photons) - with only a neglegible dependency upon distance (but please go ahead and tell us a better way of doing it). So, I have read that some 11 years ago a conclusive Bell test with Kaons was devised (and traditional realists agreed upon the conclusive nature of the latter) - you can read that in Franco Selleri's book ; hum, where can we read the test results ?

Could I ask you why you believe the dark current (or dark count) to be the only parameter which has something to do with detector efficiency ? Dark current is just the internal thermal current of electrons in the apparatus under assumption of absence of external fields. This is what you substract from the received signal, but that does not imply automatically that the received signal is what you get from the source. I guess the dark current could interfere with the received signal so that some distortion of the latter occurs (although it could very well average out in which case dark current would be irrelevant - could someone comment on this ?), but that does not fix your efficiency. Moreover it is not so clear what this has to do with the zero point field in SED (the latter would only produce quantum corrections to the dark current I presume), there the zero point field is non thermal and has no observable effects (it is believed to provide atomic stability of course) unless one has different boundary conditions for the electromagnetic field or some particle is accelerated through it (like in the Unruh effect). This is for example how they can explain the Casimir Polder effect and how a zero point field can influence the dynamics of interacting fields (detection process).

Moreover, if you use presumed sources of ``entangled photons'' as a way to calibrate your detectors, it becomes rather impossible (from a logical point of view) to consider the possibility that entanglement might not exist in the first place, no ? :-)

Careful

 

[QuantunEnigma]

Re-read the Guidelines that you have agreed to. Personal, unverified theories and ideas are NOT allowed. If you have a personal theory to push, do so in the IR forum. You have been told this before, and I very seldom repeat what has been said.

Furthermore, citation to some website does NOT strengthen your case! So stop doing that. This is not how science, and especially physics, is done. If you think you have a valid idea, cite a respected peer-reviewed journal.

I expect that this is the last time I have to explain this.

Zz.

QUOTE OF ZZ ACTION
The secret site is the one that you and i are monitoring, that is all. The one that cannot be mentioned like this [SPAM link removed - the NEXT time I have to do this, you're gone! - Zz.] because I do not know how to make it a hidden legal link to show what we are talking about. If you would show me how please I would edit this posting and leave in peace. END

Sir, I am writing to ask please correct the words of your deletion. Unless I am mistaken. The site IS NOT A SPAM SITE because not like Physics Forums it has no advertisements and I can see no reward for clicks or views. "It is a free public service science blog with references to 100 peer reviewed articles and it is based on peer reviewed and published theory that has not been changed or refuted or modified."

You are the one who can delete but in fairness your deletion should not distort facts unless i do not understand what is a SPAM SITE please. Can you say? Site deleted or personal science blog deleted.

Also, because the site is edited every day I think it cannot work under a loss of editorial freedom which your referral appears to require. The author thinks that.

I am note arguing with you right to delete, only that be fair like a scientist and present facts please. Unless i am wrong

 

[ZapperZ]

QUOTE OF ZZ ACTION
The secret site is the one that you and i are monitoring, that is all. The one that cannot be mentioned like this [SPAM link removed - the NEXT time I have to do this, you're gone! - Zz.] because I do not know how to make it a hidden legal link to show what we are talking about. If you would show me how please I would edit this posting and leave in peace. END

Sir, I am writing to ask please correct the words of your deletion. Unless I am mistaken. The site IS NOT A SPAM SITE because not like Physics Forums it has no advertisements and I can see no reward for clicks or views. "It is a free public service science blog with references to 100 peer reviewed articles and it is based on peer reviewed and published theory that has not been changed or refuted or modified."

You are the one who can delete but in fairness your deletion should not distort facts unless i do not understand what is a SPAM SITE please. Can you say? Site deleted or personal science blog deleted.

Also, because the site is edited every day I think it cannot work under a loss of editorial freedom which your referral appears to require. The author thinks that.

I am note arguing with you right to delete, only that be fair like a scientist and present facts please. Unless i am wrong

Then cite the exact paper that support your position and not simply a whole webpage! That webpage is espousing a personal theory that is not back by conventional physics, regardless on whether it contains published papers or not. You have been told about our rules against speculative theories. Take it, or leave.

Zz.

P.S. I'll call it crackpot spam if that makes you feel any better.

 

[DrChinese]

1. Could I ask you why you believe the dark current (or dark count) to be the only parameter which has something to do with detector efficiency ? Dark current is just the internal thermal current of electrons in the apparatus under assumption of absence of external fields. This is what you substract from the received signal, but that does not imply automatically that the received signal is what you get from the source. I guess the dark current could interfere with the received signal so that some distortion of the latter occurs (although it could very well average out in which case dark current would be irrelevant - could someone comment on this ?), but that does not fix your efficiency. Moreover it is not so clear what this has to do with the zero point field in SED (the latter would only produce quantum corrections to the dark current I presume), there the zero point field is non thermal and has no observable effects (it is believed to provide atomic stability of course) unless one has different boundary conditions for the electromagnetic field or some particle is accelerated through it (like in the Unruh effect). This is for example how they can explain the Casimir Polder effect and how a zero point field can influence the dynamics of interacting fields (detection process).

2. Moreover, if you use presumed sources of ``entangled photons'' as a way to calibrate your detectors, it becomes rather impossible (from a logical point of view) to consider the possibility that entanglement might not exist in the first place, no ? :-)

Careful

1. I didn't mean to imply that the detector dark count is the only variable involved. It's not. There are plenty of experimental setup issues that affect total efficiency, such as beam splitters, filters and polarizers. I was really trying to focus on the detector itself as a source for false readings.

2. Yes, this does make logical sense as a way to calibrate. It doesn't really matter if you call it entanglement or not, there is an effect that is readily measured and it is really undeniable. There are virtually no cases of coincidences when the PDC source is turned off (i.e. no coincidences due to noise). Once the PDC source is turned on, there are virtually no cases of double detections on one side (i.e. 3 fold coincidences). I don't know the exact rate of 1-fold coincidences (i.e. detection of only one of a pair), so I will see if I can drill into that stat.

 

[Careful]

**1. I didn't mean to imply that the detector dark count is the only variable involved. It's not. There are plenty of experimental setup issues that affect total efficiency, such as beam splitters, filters and polarizers. I was really trying to focus on the detector itself as a source for false readings. **

Right ! Now, you seem to be stuck with the Von Neumann measurement postulate (or consciousness) and regard photons as non local plane waves. You cannot do that : (a) it makes no sense, you completely deny local physics (b) such waves are not normalizable, hence you cannot even apply the Von Neumann postulate here. Rather, you have to make a local model of detection (remember: the dynamics of QFT is local) and apply the reduction at a later stage (which gives you genuinely different results !). Now, localized wave packages (with characteristic wave length lambda) will spread around and local quantities (probability density) will decrease, affecting the probability of detection...

**
2. Yes, this does make logical sense as a way to calibrate. It doesn't really matter if you call it entanglement or not, there is an effect that is readily measured and it is really undeniable. There are virtually no cases of coincidences when the PDC source is turned off (i.e. no coincidences due to noise). **

Again, you ignore the possibility that when the source is turned on, there is an enhancement of such coincidences (as you would expect from local physics). I guess you can expect a delay between the arrival time of the ``created pair'' and arrival time of the original one. Moreover, in experiment, not all ``photons'' will have the same spatial density and many of them can get lost (as is the case in the low frequency range).

Now, you seem to be confused by my position. I am a local realist and I could really offer you good reasons why a non local world view is nonsensical (actually it is pretty easy to give a crazy local (in the strict sense!) theory behind the Von Neumann measurement postulate if you are creative enough) but I prefer to keep an open mind. As far as I am aware, it is possible to give a local theory of EPR with a local measurement dynamics (and without denying reality) - see my allusion to negative probabilities (you might be interested to read about this). However, on the other side, it is still possible to claim that a ``less quantal'' point of view is possible, see SED or better Barut self field. So, one would better do the experiment with neutral Kaons, or do experiments in which local realist predictions (deviating from the QM ones) can be checked. This would settle the matter more easily. But in ANY case (there is in the worst case a lack of creativity), there is no obvious problem with local realism as far as I am concerned, only some types of ``naive'' local hidden variable theories (the ones assuming screening off *and* dichotomic outcomes) could be killed off, but where remains the conclusive series of experiments ?

Careful

 

[DrChinese]

Now, you seem to be confused by my position. I am a local realist and I could really offer you good reasons why a non local world view is nonsensical (actually it is pretty easy to give a crazy local (in the strict sense!) theory behind the Von Neumann measurement postulate if you are creative enough) but I prefer to keep an open mind. As far as I am aware, it is possible to give a local theory of EPR with a local measurement dynamics (and without denying reality) - see my allusion to negative probabilities (you might be interested to read about this).

Sure, I am confused any time a local realist tells me an experiment should not be considered because non-local influences were not adjusted for. If you believe there is a local model which differs from Malus in its predictions, then the thing I am immediately interested in is: what are the specific values that are really present?

Sure, I am interested in negative probabilities because I think any local realistic model will yield probabilities greater than 1 or less than zero somewhere along the line. The reason I "know" this is because of Bell's discovery.

 

[ttn]

I am interested in negative probabilities because I think any local realistic model will yield probabilities greater than 1 or less than zero somewhere along the line. The reason I "know" this is because of Bell's discovery.

Could you give an example of a theory which is "local" but not "realistic" and which agrees with the QM predictions here? Or more basically, do you think that such a theory is (in light of Bell's discovery) possible?

If not, why use the cumbersome and vague phrase "local realism" when, evidently, you just mean "local"?

 

[DrChinese]

Could you give an example of a theory which is "local" but not "realistic" and which agrees with the QM predictions here? Or more basically, do you think that such a theory is (in light of Bell's discovery) possible?

If not, why use the cumbersome and vague phrase "local realism" when, evidently, you just mean "local"?

1. If you accept, as I do, that the Heisenberg Uncertainty Principle is a "complete" description of reality, then I believe you have a non-realistic position. So any interpretation of orthodox QM that matches would be such a theory.

2. I cannot avoid the phrase "local realistic" in my discussion, because this is generally accepted from Bell's work. If you believe in locality, I believe you must therefore reject realism. I also believe that it *might* be possible to construct a non-local theory which is realistic, but I am not sure about this.

 

[wm]

drChinese's "negative probabilities" rebutted?

Dear David, a rebuttal of your ''negative probability case" (from your website) may be found at [link deleted]

I would welcome any comments, especially any which make your case clearer to the general reader. Of course, if I've mispresented it, please let me know that too.

wm

 

[wm]

Would a meeting of local realists fill a phone booth?

** I am a local realist and I could really offer you good reasons why a non local world view is nonsensical (actually it is pretty easy to give a crazy local (in the strict sense!) theory behind the Von Neumann measurement postulate if you are creative enough) but I prefer to keep an open mind. As far as I am aware, it is possible to give a local theory of EPR with a local measurement dynamics (and without denying reality) - see my allusion to negative probabilities (you might be interested to read about this). However, on the other side, it is still possible to claim that a ``less quantal'' point of view is possible, see SED or better Barut self field. So, one would better do the experiment with neutral Kaons, or do experiments in which local realist predictions (deviating from the QM ones) can be checked. This would settle the matter more easily. But in ANY case (there is in the worst case a lack of creativity), there is no obvious problem with local realism as far as I am concerned, only some types of ``naive'' local hidden variable theories (the ones assuming screening off *and* dichotomic outcomes) could be killed off, but where remains the conclusive series of experiments ?

Careful

I am a local realist too. However I see no need for a sound local realistic theory to predict results "deviating from QM ones". (Thus you may take it that I seek no loop-holes in QM experimental outcomes. QM is a great theory.) Rather, it is my view that QM is an abstract local realistic theory. That is, it's my view that QM is one level of abstraction removed from a wholly concrete local realistic theory.

Now the start of this thread related to Harrison's inequality. So, in support of my view, a draft rebuttal of Harrison's inequality may be found at [link deleted]. It is a draft only in the sense that I'd like David Harrison or BoTemp to check that it accurately presents their case.

wm

 

[ZapperZ]

Dear David, a rebuttal of your ''negative probability case" (from your website) may be found at [link deleted]

I would welcome any comments, especially any which make your case clearer to the general reader. Of course, if I've mispresented it, please let me know that too.

wm

Y'know, for some odd reason, my repeated warning for your personal work to be done in the IR forum seems to have fallen onto deaf ears. Obviously, you appear to think that this is a joke.

Thus, you leave me no choice with your continuing transgression of our guidelines. This thread is done.

Zz.