Phys. Rev. A 72, 062315 (2005) [8 pages]Phase-space contraction and quantum operationsReceived 25 August 2005; published 9 December 2005 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.72.062315
DOI:
10.1103/PhysRevA.72.062315
PACS:
03.67.Lx, 03.65.Ca, 03.65.Yz, 05.45.Mt
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