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We study a quantum model of dynamical Casimir effect in an optical cavityenclosed by a freely moving mirror attached to a harmonic spring. The quantumfluctuations of the friction force exerted by the dynamical Casimir emissiononto the moving mirror are investigated, as well as their consequences on thequantum state of the mirror oscillation. Observable signatures of the interplayof the nonlinear nature of the effective mirror-cavity coupling and of thediscreteness of the emitted photons are pointed out, in particular as a fastdiffusion of the mirror oscillation phase. These results are interpreted in thelanguage of quantum field theories on curved space-times as a breakdown of thestandard semiclassical theory of the backreaction.

Quantum fluctuations of the friction force induced by the dynamical Casimir emission