Mixing and decoherence to nearest separable states in quantum measurements

Details Mixing and decoherence to nearest separable states in quantum measurements Mixing and decoherence to nearest separable states in quantum measurements

2007-05-05

arxiv.org/abs/0705.0733v2

Physics

Quantum Physics

6 pages, 2 figures

Scientific paper

We illustrate through numerical results a number of features of environment-induced decoherence under a broad class of apparatus-environment interactions in quantum measurements wherein the reduced system-apparatus density matrix evolves towards the nearest separable state and, in addition, there occurs a mixing in relevant groups of apparatus microstates (see below). The resulting final state is unique and correctly embodies the measurement statistics even in the absence of environment-induced superselection because of energy differences between these groups of states. The partial transpose remains non-positive throughout the process.

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