Quantum noise effects in strongly driven systems

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For strongly driven systems where the coupling is weak and for frequencies near resonance, the Lax formula has proved to be an invaluable tool for calculating two-time correlation functions, as we have recently discussed in detail [1]. Nevertheless, we also stressed that this does not imply a quantum generalization of the Onsager hypothesis but in fact that the correct quantum generalization of this hypothesis is the fluctuation dissipation theorem. Here we discuss the fluctuation-dissipation theorem in more detail (by expressing a general correlation function in terms of both a relaxation function and a response function) and the conditions under which it leads to the Onsager hypothesis.

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Laser Physics

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