David, I know you to be a gentleman and a scholar from your posts. I don’t want to go off topic with our discussion on quantum mechanics too much and I hope you don’t mind some friendly banter.
For the sake of the OP let me be clear that classical electromagnetic wave theory is all that one needs to understand the simple results of most tests (including the ones offered in the videos) that claim things like wave-particle duality, etc. The problem is that very few physicists actually understand classical electromagnetic wave theory so they jump to mechanical understandings of these things. Quantum mechanics is completely buried in electromagnetic theory. But for one who does not understand classical EM theory and lacks the necessary tools (Maxwell’s equations in time varying non-linear media) quantum mechanics provides a simpler tool set, but leads to some erroneous interpretations of how things really work.
The creator (Nobel prize winning physicist Charles Lamb) of what is now known as quantum electrodynamic theory was very much against the concept of a photon or wave-particle duality and actually created quantum electromagnetic theory directly from Maxwell’s equations.
Max Plank was always against the concept of a photon and instead put the discrete energy state on the material, or the detector itself where it belongs.
Modern physics now understands that Einstein got things wrong when he put the discrete energy levels on the electromagnetic wave when describing the photo-electric effect. The discrete energy levels can just as easily be on the material or the detector. So no light particles are needed, just a harmonic resonating detector (with discrete frequency energy states).
Compton has a chapter in his classic book on Compton scattering that describes how the Compton scattering effect can be described with classical wave theory, but the photon theory provides for much easier math (for those not versed in classical EM theory).
So without the need for photons in the double slit experiment, we simply interpret the results as wave interactions. When the field strength is very low, it just means that we have very low SNR on the detector and since the thermal noise signal from within the detectors are uncorrelated we see no interference pattern. These are NOT photons, they are just discrete detections triggered by the self noise of the detector. Since the self noise is limited to a narrow bandwidth (since narrow band filters are used) the noise itself is a coherent source that can destructively interfere with the weak signal from the light. In the end there are two time varying voltage signals generated by the detector, one from the signal, one from the self noise. These two band-limited signals interfere with each other. This is because light is a wave and not a particle. So you can have light impinging on a detector but the detector reads zero since the Signal plus Noise can cancel and does in a well understood pattern described by advanced mathematical detection statistics…
You will note complaints such as saying that two particles can’t cancel out, reveal an a-prior assumption that light is a particle and not a wave. This is one of the modern mistakes of amateur interpretations of quantum mechanics that leads to all of the wacky interpretations.
Please understand OP that I am not saying that quantum mechanics is wrong. I am saying that quantum mechanics is entirely described by classical electromagnetic theory, and was in fact derived directly from it. But after a bunch of approximations, it leads to a simple set of equations that can also be interpreting using particles instead of waves and arrives at the same results. But what is going on in the real world is waves, not particles. If one looks at things as if the particles were real, then one is forcing a non-physical model onto reality which when used to infer further information leads to erroneous results. Like for example, when one says that two particles can’t cancel.
It is circular logic:
- Since light is a particle, then two particles can’t cancel.
- Since we see a detection on one detector but not the other then we must have a single photon that impinges on the detector.
- Since only one photon was present it must have gone through only one slit and not both.
- Therefore light is a particle and not a wave.
Can you see the circular logic OP?