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I create an entangled photon pair. One photon is sent inside a resonant cavity which reflects the photon many number of times. Will there be decoherence between photon in the resonant cavity and its entangled partner? If yes why should it happen? Also is decoherence affected by type of surface of mirror i.e Glass Vs Metal.

Qmechanic
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user43794
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2 Answers2

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No, since mirrors don't cancel the wavyness and preserve phase.

Same for simple transport in a medium (having a refraction index), BTW.

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user43794
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