Quantum phase space distributions in thermofield dynamics
S. Chaturvedi, V. Srinivasan, G. S. Agarwal
Abstract
It is shown that the the quantum phase space distributions corresponding to a density operator ρ can be expressed, in thermofield dynamics, as overlaps between the state ρ> and "thermal" coherent states. The usefulness of this approach is brought out in the context of a master equation describing a nonlinear oscillator for which exact expressions for the quantum phase distributions for an arbitrary initial condition are derived.
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