#### zonde

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Wave function collapse for photons is actually subsampling of whole sample of photons. That way wave function collapse can happen instantaneously in the whole experimental setup or even backwards in time.

Photon entanglement mystery holds on one wrong assumption about realistic explanation. It is that whole sample of photons (assuming it is possible to detect it) should show correlations of polarization. If you assume quite the opposite then it can be seen that this will lead to serious bias in experimental setup. Namely increasing quantum effectiveness will lead to decrease of correlation visibility. This effect actually can be easily tested - increase of quantum effectiveness usually increases dark counts as well but it can be calculated if increase in dark counts alone can explain decrease of correlation visibility or it is not enough.

Post selection in entanglement experiments can be seen as macroscopic quantum measurement e.g. taking subsamples from whole detected samples of Alice and Bob resulting in a kind of wave function collapse.

This question can be approached from other side as well. If one considers reasons for nondetections of photons in detectors it can be seen that there is not much place for classical randomness needed for fair sampling assumption. Some randomness can result from permanent defects in crystal structure of detector material, some from temporary effects resulting from thermal fluctuations. But still big part of possible randomness can result from properties of photons - polarization and phase. Possible randomness from direction of photons is reasonable to assume if wave length of photon is comparable with length scale of crystal structure of detector.

It can be hard to prove that in principle but it is clearly unreasonable to discard the idea that nondetection correlates with properties of photons.

So I say that missing part of QM is undetected photons.

Any comments?