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1. Single photon interference

2. Interference between two photons

3. Two-photon interference

1. Some literature says that only single photon/particle interference exists.

Can two photons interfere with each other?

2. Can the "waves" of two photons interfere with each other?

By waves I mean as posited by the DeBroglie-Bohm (DBB) interpretation.

i.e. if two photons are sent separately through their own set of double slits;

as we bought the double slits closer would there be interference between the "waves" of photon A with that of photon B?

we are talking about - a total of 4 slits i.e. two double slits being brought closer.

3. Does two-photon = entangled photons/particles?

4. Do two-photon interfere?

5. Can they do so non-locally?

6. What is the relation between relation between two-photon interference and coherence?