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Quantum field theory in curved spacetime is used to show that gravitational redshift induces a unitary transformation on the quantum state of propagating photons. It is found that the transformation is a mode‐mixing operation, and a protocol that exploits gravity to induce a Hong–Ou–Mandel‐like interference effect on the state of two photons is devised. It is discussed how the results of this work can provide a demonstration of quantum field theory in curved spacetime.
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Bruschi et al. (2022) studied this question.
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