Recent content by gespex

Hi all, Imagine a double slit experiment where each slit contains a polarization filter with some angle relative to each other (\alpha). If the polarization filters are parallel the usual interference pattern will emerge, and when they are perpendicular no interference pattern will emerge. What...

Pardon my ignorance, but how did they know they measured 75% of the entangled photons? Even if they can show they measured 75% of the photons, they can't say for sure they'll measure 75% of the *entangled* photons without assuming fair sampling. And the only way to know which photons got...

Hi all, Okay, I'm writing this post keeping in mind that FTL communication (or even backward in time communication) are impossible. However, I fail to understand why this would be impossible using the delayed choice quantum eraser, so my question is: where is the error in my logic here...

Thanks for your answer. I did manage to reproduce the answer now. Though I didn't know integration in spherical coordinates. I actually did convert it to spherical coordinates (right?), with p = 1 (the distance from the origin), except I didn't take into account the "Jacobian determinant". I...

Hi all, I'm working on a math problem with a known answer - though I can't reproduce the maths. The problem is this: there is a random 3d vector of unit length with a uniform probability, \vec{v}, and a secondary unit vector \vec{u}. It is stated that: f = \int_{S^2}{| \vec{v} \cdot...

Thanks for your answers, guys! Really appreciated, but I have a few questions left. @DrChinese: But isn't λA completely random per particle? Yes, if it's close to the measured angle it has a greater chance to be measured (at one side, not at the other). However, the angle between λA and a is...

Thanks for your reply! Though the article I provided (http://arxiv.org/pdf/quant-ph/9905018v1.pdf) seems to have such a local hidden variable theorem, which completely agrees with QM's predictions. So why is it still assumed that there is some sort of collapse, rather than that very model...

I don't like bumping - but isn't this a fair question? I've found a paper that seems to correspond with the QM predictions here: http://arxiv.org/pdf/quant-ph/9905018v1.pdf I know it's "only" arxiv, but the maths look sound...

Hi all, I'm no expert in quantum mechanics by any means, but I've been quite interested in, and done quite some research on, Bell's theorem and related inequalities such as CH and CHSH. The theories all look perfectly sound, except that they all contain the "no enhancement assumption", some...

Ok, got it, thanks!

Thanks for the replies, but which of the two is it ;-)? Zarqon: yes, I mean the average/expected photon count. So who of you two is right? Or both: I'm not sure what Fock states are, so maybe Zarqon considered that to be implicit?

Hi all, If we have any setup that causes diffraction with light, such as a single slit, and count the number of photons detected at a certain point behind this slit, is it true that we can determine this count as follows: 1. Consider each point in the slits a new wave source, and calculate...

Hi all, I'm a bit confused about the polarization state of the photons after the BBO. I am aware that they are polarized orthogonally, but are they polarized according to a certain axis? The reason I'm asking is that one article I read seems to imply that that's not the case: i.e. the...

Indeed, my curiosity leads me to wonder whether QM is only a specific subset of reality. There seem to be loopholes in every experiment that proves quantum mechanics, and it seems, though I'm no expert, that such loopholes may be innate to the theory of QM. I don't dismiss QM. I just wonder...

Hello everybody, I was wondering: why is "spooky action at a distance" considered to be more likely than a detection loophole? That is to say, why is Bell's Theorem assumed to imply that two entangled particles must communicate faster than light, rather than saying that a subset of particles...