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A recent PNAS article got into this and described a photon as a superposition and an incoherent photon as a thermal mixture, but from a semi-classical point of view it's hard to see how a single photon can be "coherent" since coherence is defined through relationships between photons (or at least the waves that describe them).

I obviously don't know much about this stuff, so if anyone has any thoughts, they'd be very much appreciated.