Recent content by Christian Thom

Thank you all. I surrender !

Thank you for your reply. I nevertheless would not be so positive about the vacuity of the BH. It is true that the Schwarzchild are only valid for vacuum space, but that doesn't mean that the actual BH are of this kind. As for the tidal waves, we have a some evidence for them : gravitational...

The presence of a big mass (BH or neutron star) in the vicinity of a BH must have an effect on the shape of the event horizon, an indentation comes logically to mind. When the system is rotating, it would lead to tidal effects on the horizon that would disclose internal material of the BH. This...

Thank you all for your answers that clarifie the situation. I guess the impossibility to have this kind of entanglement is not limited to spdc, but generalizes to other methods of producing entangled pairs.

Consider this thought experiment : we use a source of identically vertically polarized photons, such as produced by a type 0 SPDC. One beam go to Alice and the second to Bob. 1. Whatever measurement Bob makes on its beam, if Alice use a vertically polarized detector, all photons are detected...

Thank you for this thorough explanation that I have now to process !

Thank you. It is certainly a similar experiment, but it lacks the clarity brought by the momentum entanglement, which can correlate directly to the slits position.

Thank you. If it is a normal photon, why can't it interfere with itself ?

I worked in a lab that measured the distance Earth to moon with laser pulses, only few photons returned due to the distance, but the assumption that they move at the speed of light was never questioned and results were coherent with the expected movement of the moon, that is of course in the...

In Kaur, M., Singh, M. Quantum double-double-slit experiment with momentum entangled photons. Sci Rep 10, 11427 (2020). https://doi.org/10.1038/s41598-020-68181-1 and in C. K. Hong and T. G. Noh, "Two-photon double-slit interference experiment," J. Opt. Soc. Am. B 15, 1192-1197 (1998) it is...

Thank you all.

If you consider a beam like the one at the origin of the experiment above, in absence of S&G devices, the slightest natural magnetic gradients would play the same role as the S&G device, and if the recombination was so difficult to obtain, that would result in the loosing of the spin purity of...

I would think that there must be some leeway, otherwise free beams of definite spin particles would loose more or less quickly their spin definiteness due to spurious magnetic gradients that are always present in actual experiments.

How this result depends on the equality of the path lengths of the two separated beams ?

Thank you.