The linear stochastic Schr\"odinger equation of a cavity mode subject to a homodyne measurement and to a phase-sensitive feedback loop realized with part of the output homodyne photocurrent is derived. We show that quantum feedback has stabilizing effects which manifest themselves in a significant retardation of the decoherence of a Schr\"odinger-cat state. {} 1996 The American Physical Society.
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Goetsch et al. (1996) studied this question.