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We study the photon production in a one-dimensional cavity whose left and right walls oscillate with the frequency ΩL and ΩR, respectively. For ΩL≠ΩR, the number of generated photons by the parametric resonance is the sum of the photon numbers produced when the left and the right wall oscillates separately. However, for ΩL=ΩR, the interference term proportional to cosφ is found additionally, where φ is the phase difference between two oscillations of the walls.
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Ji et al. (1998) studied this question.
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