Quantum to classical transition and entanglement sudden death in Gaussian states under local heat bath dynamics

Details Quantum to classical transition and entanglement sudden death in Gaussian states under local heat bath dynamics Quantum to classical transition and entanglement sudden death in Gaussian states under local heat bath dynamics

2010-05-23

arxiv.org/abs/1005.4224v2

Phys. Rev. A 82 042337 (2010)

Physics

Quantum Physics

Published in PRA

Scientific paper

10.1103/PhysRevA.82.042337

Entanglement sudden death in spatially separated two-mode Gaussian states coupled to local thermal and squeezed thermal baths is studied by mapping the problem to that of the quantum-to-classical transition. Using Simon's criterion concerning the characterisation of classicality in Gaussian states, the time to ESD is calculated by analysing the covariance matrices of the system. The results for the two-mode system at T=0 and T>0 for the two types of bath states are generalised to $n$-modes, and are shown to be similar in nature to the results for the general discrete $n$-qubit system.

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