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PeterDonis said:No, it doesn't. A laser emits a coherent state, which is very different from a Fock state (the latter is an eigenstate of photon number). A coherent state is the closest kind of quantum state to a classical EM field.
Humm... we could use a different source of photons than a laser. A device which emits exactly 1 right-handed photon at a time? Then it is kind of a coherent source, still.
The far-away observer will in rare cases detect a left-handed photon along with a right-handed one.
The particle interpretation is that the photon scattered from a graviton and split in two. The graviton hypothesis has the well-known problem that it is not renormalizable.
The classical wave interpretation is that a standard wave packet stretched into a chirp as it flew out of the gravitational field.
Why is there no renormalization problem in the classical interpretation?