J4 ›› 2011, Vol. 28 ›› Issue (1): 58-64.

• 量子光学 • 上一篇    下一篇

非马尔科夫环境下耦合超导量子比特纠缠态的纠缠消相干

嵇英华1,2,徐林1   

  1. 1 江西师范大学物理与通信电子学院, 江西 南昌 330022;
    2 江西省光电子与通信重点实验室, 江西 南昌 330022
  • 收稿日期:2010-04-06 修回日期:2010-05-07 出版日期:2011-01-28 发布日期:2011-01-14
  • 通讯作者: 嵇英华 江西临川人,教授,主要从事量子信息方向的研究。 E-mail:ahmxhxtt@yahoo.cn
  • 基金资助:

    国家自然科学基金(10864002)

Entanglement decoherence of coupled superconductor qubits entangled states in non-Markovian environment

JI Ying-Hua1,2,  Xu Lin1   

  1. 1 College of Physics and Communication Electronics, Jiangxi Normal University, Nanchang 330022, China
    2 Key Laboratory of Optoelectronic and Telecommunication of Jiangxi, Nanchang  330022, China 
  • Received:2010-04-06 Revised:2010-05-07 Published:2011-01-28 Online:2011-01-14

摘要:

利用共生纠缠度比较详细地研究了一个超导耦合量子比特在非马尔可夫环境下纠缠消相干的演化。研究结果表明:对于不同纠缠初态下的超导耦合量子比特,由于环境作用的记忆反馈效应,处于热平衡环境中的耦合量子比特的纠缠度总是会单调地趋向于零。进一步的研究结果还表明:在非马尔可夫过程中会很快地出现纠缠的突然死亡,耗散越强,纠缠的死亡越快;而在马尔可夫过程中则是缓慢地趋向纠缠的死亡。

关键词: 量子光学, 纠缠, 耦合量子比特, 非马尔可夫过程, 共生纠缠度

Abstract:

The evolution of entangled decoherence is investigated detail in non-Markovian environment of coupling superconducting qubits through using concurrence function. The results show that, for coupling superconducting qubit under different entangled initial states, because of the role of memory feedback due to environmental effect, the entanglement of coupling superconducting qubits under a thermal bath will always be monotonically tends to zero. Further results also showed that, the sudden death of entanglement will soon be found in non-Markovian process, the stronger the dissipation, the faster the death of entanglement. But in Markovian process, it tends to death of entanglement slowly.

Key words: entanglement, coupled qubits, non-Markovian process, concurrence

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