Stability of pairwise entanglement in a decoherent environment

Jian-Ming Cai, Zheng-Wei Zhou, and Guang-Can Guo

Phys. Rev. A 72, 022312 – Published 12 August 2005

Abstract

Considering the dynamics of a two-qubit entangled system in the decoherence environment, we investigate the stability of pairwise entanglement under decoherence. We find that for different decoherence models, there exists some special class of entangled states of which the pairwise entanglement is the most stable. The lifetime of the entanglement in these states is larger than other states with the same initial entanglement. In addition, we also investigate the dynamics of pairwise entanglement in the ground state of spin models such as Heisenberg and $X X Y$ models.

Received 14 December 2004

DOI:https://doi.org/10.1103/PhysRevA.72.022312

Authors & Affiliations

Jian-Ming Cai^*, Zheng-Wei Zhou^†, and Guang-Can Guo

Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences, Hefei, Anhui 230026, China

^*Electronic address: jmcai@mail.ustc.edu.cn
^†Electronic address: zwzhou@ustc.edu.cn

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Vol. 72, Iss. 2 — August 2005

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