中国物理B ›› 2007, Vol. 16 ›› Issue (6): 1489-1504.doi: 10.1088/1009-1963/16/6/001

• GENERAL •    下一篇

Suppression of decoherence by bath ordering

景俊, 马红孺   

  1. Institute of Theoretical Physics, Shanghai Jiaotong University, Shanghai 200240, China
  • 收稿日期:2006-08-24 修回日期:2007-01-07 出版日期:2007-06-20 发布日期:2007-06-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10334020 and 90103035), and in part by the Chinese Minister of Education Program for Changjiang Scholars and Innovative Research Team in University.

Suppression of decoherence by bath ordering

Jing Jun(景俊)† and Ma Hong-Ru(马红孺)   

  1. Institute of Theoretical Physics, Shanghai Jiaotong University, Shanghai 200240, China
  • Received:2006-08-24 Revised:2007-01-07 Online:2007-06-20 Published:2007-06-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10334020 and 90103035), and in part by the Chinese Minister of Education Program for Changjiang Scholars and Innovative Research Team in University.

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摘要： The dynamics of two coupled spins-1/2 coupled to a spin-bath is studied as an extended model of the Tessieri--Wilkie Hamiltonian. The pair of spins served as an open subsystem is prepared in one of the Bell states and the bath consisting of some spins-1/2 is in a thermal equilibrium state from the very beginning. It is found that with increasing coupling strength of the bath spins, the bath forms a resonant antiferromagnetic order. The polarization correlation between the two spins of the subsystem and the concurrence of it are recovered to some extent in the isolated subsystem. This suppression of the subsystem decoherence may be used to control the quantum devices in practical applications.

Abstract: The dynamics of two coupled spins-1/2 coupled to a spin-bath is studied as an extended model of the Tessieri--Wilkie Hamiltonian. The pair of spins served as an open subsystem is prepared in one of the Bell states and the bath consisting of some spins-1/2 is in a thermal equilibrium state from the very beginning. It is found that with increasing coupling strength of the bath spins, the bath forms a resonant antiferromagnetic order. The polarization correlation between the two spins of the subsystem and the concurrence of it are recovered to some extent in the isolated subsystem. This suppression of the subsystem decoherence may be used to control the quantum devices in practical applications.

Key words: decoherence, open subsystem, Bell states, thermal equilibrium, polarization correlation

中图分类号:  (Decoherence; open systems; quantum statistical methods)

  • 03.65.Yz
03.65.Ud (Entanglement and quantum nonlocality)