Non-Markovian entanglement dynamics of noisy continuous-variable quantum channels

Jun Hong An, Wei Min Zhang

Research output: Contribution to journalArticle

135 Citations (Scopus)

Abstract

We investigate the entanglement dynamics of continuous-variable quantum channels in terms of an entangled squeezed state of two cavity fields in a general non-Markovian environment. Using the Feynman-Vernon influence functional theory in the coherent-state representation, we derive an exact master equation with time-dependent coefficients reflecting the non-Markovian influence of the environment. The influence of environments with different spectral densities, e.g., Ohmic, sub-Ohmic, and super-Ohmic, is numerically studied. The non-Markovian process shows its remarkable influence on the entanglement dynamics due to the sensitive time dependence of the dissipation and noise functions within the typical time scale of the environment. The Ohmic environment shows a weak dissipation-noise effect on the entanglement dynamics, while the sub-Ohmic and super-Ohmic environments induce much more severe noise. In particular, the memory of the system interacting with the environment contributes a strong decoherence effect to the entanglement dynamics in the super-Ohmic case.

Original languageEnglish
Article number042127
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume76
Issue number4
DOIs
Publication statusPublished - 2007 Oct 31

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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