I see, double slit experiment for one particle at a time shows interference for a probability wavelet. I understand this experiment quiet well but still I wish for something simpler.
One last question, I am always wondering, what if I do a double slit interference in a cloud chamber, will we get different result? But I could also argue that doing double slit interference in non vacuum will decohere the wavelet too?
Probability wave interference is the classic way of explaining the double slit experiment, but I don't think it's necessary. Worse still, probability waves are, in all likelihood, nothing more than a fantasy made up by some physicists. (What is it "made of"?--not energy, and certainly not matter--it creates more problems and questions than it solves). Certainly nobody has ever seen one. They're a construct some physicists have made to provide a conceptual framework of what is happening.
The way I see it, the seemingly unusual results of the double slit experiment are a consequence of the universe having a matter perspective, as well as an energy perspective, which are both valid. This is why we find what we call the particle/wave duality of light. (Such a duality exists for more than just light, however.)
We're used to seeing the experiment from the matter perspective. We're firing photons (from the matter perspective) and they have a probabilistic chance of moving through one slit or the other. We look at it and wonder how this photon can interfere with it very self as though it went through both slits.
But look at it from the photon's perspective. For the frame of reference of a photon time does not exist. In other words, the elapsed time from when it is emitted to when it is absorbed is zero *from the photon's perspective* (an equally valid perspective as ours, but different). This also must mean that the distance between emission and absorption must also be zero *from the photon's perspective*. Therefore all paths from the emitter to the screen are zero, which is like saying the screen at all points is "in contact" with the emitter, *FTPP*. But because of the barrier and the slits, not all of these paths are equally likely. The size, shape, and location of the slits determine areas which have a much greater chance of being "hit." (A probability, but not a "probability wave".
So in effect, the photon really does pass through both slits and interferes with itself, but this spatial relation of the slits as being separate from each other, and of the photon interfering with itself--all this only happens from the matter perspective (which is, as I said before, equally valid--and in this case, much more in keeping with our ordinary perceptions).
I'd be interested in hearing thoughts anyone might have about this interpretation.
--Mike from Shreveport