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"Phase-Space Contraction and Quantum Operations"
I. García Mata, M. Saraceno, M.E. Spina and G. Carlo
Phys. Rev. A 72(6) (2005) 062315/1-8
We give a criterion to differentiate between dissipative and diffusive quantum operations. It is based on the classical idea that dissipative processes contract volumes in phase space. We define a quantity that can be regarded as quantum phase space contraction rate and which is related to a fundamental property of quantum channels: nonunitality. We relate it to other properties of the channel and also show a simple example of dissipative noise composed with a chaotic map. The emergence of attractor-like structures is displayed.
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