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

Sandeep K. Goyal and Sibasish Ghosh
Phys. Rev. A 82, 042337 – Published 29 October 2010

Abstract

Entanglement sudden death (ESD) 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 characterization of classicality in Gaussian states, the time to ESD is calculated by analyzing 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 generalized to n modes, and are shown to be similar in nature to the results for the general discrete n-qubit system.

  • Received 19 August 2010

DOI:https://doi.org/10.1103/PhysRevA.82.042337

©2010 American Physical Society

Authors & Affiliations

Sandeep K. Goyal* and Sibasish Ghosh

  • Center for Quantum Sciences, The Institute of Mathematical Sciences, CIT Campus, Taramani, Chennai 600 113, India

  • *goyal@imsc.res.in
  • sibasish@imsc.res.in

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Issue

Vol. 82, Iss. 4 — October 2010

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