Abstract
We provide a detailed description of the response of an experimentally accessible, open, driven quantum system in its stationary state to a weak periodic signal. The system, a single mode of the quantized radiation field in coherent interaction with a sequence of two-level atoms and coupled to an environment of temperature T, is shown to exhibit stochastic resonance on output, under changes of T. Furthermore, at vanishing temperature, the transition rates between the metastable states of the radiation field remain finite and are set by the quantum noise level at . Consequently, signal enhancement and synchronization can be achieved even in this very quantum limit, for a properly tuned signal frequency.
Published Version
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