How to know if two photons are entangled?

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SUMMARY

To determine if two photons are entangled, one cannot assess entanglement from a single pair of photons. Instead, statistical analysis is required, necessitating the generation of multiple pairs of photons from a black box. By calculating the correlations between the emitted pairs, one can ascertain the presence of entanglement. This method relies on the principles of quantum mechanics and statistical inference.

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If I give you a black box and two photons go out of it (not necessarily in opposite directions), how can we know if the photons are entangled?
 
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Dorilian said:
If I give you a black box and two photons go out of it (not necessarily in opposite directions), how can we know if the photons are entangled?
One can't. But if the box produces _many_ pairs of photons, one can calculate statistics and decide on the basis of that.
 
A. Neumaier said:
One can't. But if the box produces _many_ pairs of photons, one can calculate statistics and decide on the basis of that.

Ok, so, we need to deduce what kind of entanglement we have to do the experiments. Thanks.
 

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