Creating radiowave entangled photons

[Ponderer]

The difficulty is not to produce a photon but to produce one and only one photon. I don't know the specific buildup of your source in your simulator, but isn't it rather a coherent wave at very low intensity what's simulated? This then is not a one-photon Fock state but mostly vacuum in superposition with all other Fock states with arbitrary photon number.

I didn't know how a single photon pulse signal would appear. So in my simulation I used a very short pulse. If you look the spectrum, it's of course not a single feequency. Honestly I don't know how it would be possible to go from not producing a photon to suddenly producing just exactly one photon at one exact single frequency. At least as far as the fft spectrum is concerned. What I'm thinking is that although the signals for photons at other frequencies may be present in the electrical current pulse, that doesn't mean they will be form a photon. Like the formula shows, e=hv there must be sufficient energy. So in the fft spectrum I see there's a peak in the spectrum, and so that peak frequency is probably the highest likelihood of producing a single photon.

The electronics won't have any problem creating the current signal through the antenna, but I don't know exactly how the photon itself is created. I mean, oscillating or changing current seems one requirement. Although I've read that virtual particles create the near field. Thus I would assume that such near field is at least partially responsible for creating the far field?

 

[Harbor_Seal]

I would like to create entangled photons at radiowave frequencies. To do this I thought it might help to understand as much details as possible how entangled photons are created by parametric down-conversion. Since the down-conversion doesn't happen often, what are the special conditions? Are the two photons created by two electrons, or one? What exactly is happening with the electron(s)?

Why even try to create an outdated radio wave, why not try to create a wave that can converse with Mars landers in real time, sheesh, radios were designed to use vacuum tubes.

 

[Ponderer]

Sorry, I didnt mean simply lowering the current would generate single photons. But regarding that I think it's difficult to achieve single current path using resistors that are under cryogenic temperatures and if that would be achievable I think it would still not work as single electrons oscillating in an antenna are not the ones that create single radiowaves in an antenna.
The method that I am aware of that scientists use to achieve single photons today is using quantum mechanical two states systems like quantum dots that can confine single electrons to produce single photons when they relax.

Is it possible to create a single photon in the radio wave spectrum that's produced by many electrons, rather than one electron? In radio wave theory the near and far fields are often treated as two separate things. The near field is lossless because all of it returns. It's the inductive aspect. The far field on the other hand doesn't return and has resistance; radiation resistance. In QM I was reading that the near field is created by virtual particles. So I'm wondering if what usually happens at radio wavelengths is that many electrons create one single photon. Any thoughts?

 

[Ponderer]

CUORE's cryogenics cost something around $2M - perhaps more, since these are capital costs and don't include scientific labor.

This whole thing was triggered by "I know a lot about radio, wouldn't that be easier?" and it's pretty clear that it is not easier. It's not been stated how you create a single pair of photons in the radio spectrum, much less an entangled pair. Also, the background is huge: let's say we're working at 1 GHz, 1 square meter (probably way too small) and 6 mK. Black body radiation is 100 million photons per second. One of which is the one you want.

I agree that the temp must be very low if we want to actually see a single photon on the oscilloscope. At 200K I was getting roughly 120 photons per wavelength according to blackbody radiation calculators. So yeah it would be difficult to see one photon over a hundred or more.

At room temps I think its possible to see a stream of photons, even if it's only one photon every 100 wavelengths because its coherent. As you know, noise is not coherent.

[edit: if memory holds true, this was ~120 photons per wavelength from a bandwidth from 10GHz to 1GHz at 200K.]

 

[Ponderer]

Why even try to create an outdated radio wave, why not try to create a wave that can converse with Mars landers in real time, sheesh, radios were designed to use vacuum tubes.

I think we know the physics for space communication, but I have yet to see experiments that satisfy my curiosity of radio wave photons. For example, what does the antenna current look like when a photon is emitted? And what does it look like when absorbed? What's required to create entangled radio wave photons? Radio wavelengths are relatively large, and therefore perhaps it's easier to see what's happening. We know something's happening with the virtual particles. Maybe it's possible to create a single photon with many electrons. Who knows what's to be discovered because I haven't seen any single photon radio wave experiments. I'm not suggesting the following is true, but who knows, just maybe the single photon has bandwidth, and the single frequency we see in the e=hv formula just might be the peak frequency. I'm just saying. I don't have much money at all right now. And such experiments seem feasible for me.

 

[Nugatory]

I'm not suggesting the following is true, but who knows, just maybe the single photon has bandwidth, and the single frequency we see in the e=hv formula just might be the peak frequency.

This thread is slipping into personal theories and speculation, which are not allowed under the PF rules... Time to close it.

Feynmann's book "QED: The strange theory of light and matter" is a good non-technical introduction to what a photon is and how different is from the popular conception of a particle that is emitted when we manipulate electromagnetic fields to produce electromagnetic radiation.