中国物理B ›› 2009, Vol. 18 ›› Issue (2): 597-603.doi: 10.1088/1674-1056/18/2/035

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Decoherence of two-qubit system in a non-Markovian squeezed reservoir

王发强, 张智明, 梁瑞生   

  1. Laboratory of Photonic Information Technology, School of Information and Photoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China
  • 收稿日期:2008-07-16 修回日期:2008-08-11 出版日期:2009-02-20 发布日期:2009-02-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 60578055), and the State Key Program for Basic Research of China (Grant Nos 2007CB925204 and 2007CB307001).

Decoherence of two-qubit system in a non-Markovian squeezed reservoir

Wang Fa-Qiang(王发强), Zhang Zhi-Ming(张智明)†, and Liang Rui-Sheng(梁瑞生)   

  1. Laboratory of Photonic Information Technology, School of Information and Photoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China
  • Received:2008-07-16 Revised:2008-08-11 Online:2009-02-20 Published:2009-02-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 60578055), and the State Key Program for Basic Research of China (Grant Nos 2007CB925204 and 2007CB307001).

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摘要： The decoherence of two initially entangled qubits coupled with a squeezed vacuum cavity separately is investigated exactly. The results show that, first, in principle, the disentanglement time decreases with the increase of squeeze parameter r, due to the augmenting of average photon number of every mode in the squeezed vacuum cavity. Second, there appear entanglement revivals after the complete disentanglement for the case of even parity initial Bell state, while there occur the entanglement decrease and the entanglement revival before the complete disentanglement for the case of odd parity initial Bell state. The results are quite different from those for the case of qubits in a vacuum cavity.

关键词: decoherence, squeezed reservoir, non-Markovian, qubit

Abstract: The decoherence of two initially entangled qubits coupled with a squeezed vacuum cavity separately is investigated exactly. The results show that, first, in principle, the disentanglement time decreases with the increase of squeeze parameter r, due to the augmenting of average photon number of every mode in the squeezed vacuum cavity. Second, there appear entanglement revivals after the complete disentanglement for the case of even parity initial Bell state, while there occur the entanglement decrease and the entanglement revival before the complete disentanglement for the case of odd parity initial Bell state. The results are quite different from those for the case of qubits in a vacuum cavity.

Key words: decoherence, squeezed reservoir, non-Markovian, qubit

中图分类号:  (Quantum computation architectures and implementations)

  • 03.67.Lx
03.65.Yz (Decoherence; open systems; quantum statistical methods) 42.50.Dv (Quantum state engineering and measurements)