Non-Markovian entanglement dynamics between two coupled qubits in the same environment
文献类型：期刊论文
| 作者 | Cui, Wei1,2; Xi, Zairong1 ; Pan, Yu1,2
|
| 刊名 | JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
 |
| 出版日期 | 2009-04-17 |
| 卷号 | 42期号:15页码:13 |
| ISSN号 | 1751-8113 |
| DOI | 10.1088/1751-8113/42/15/155303 |
| 英文摘要 | We analyze the dynamics of the entanglement in two independent non-Markovian channels. In particular, we focus on the entanglement dynamics as a function of the initial states and the channel parameters, such as the temperature and the ratio r between omega(0), the characteristic frequency of the quantum system of interest, and omega(c), the cut-off frequency of the Ohmic reservoir. We give a stationary analysis of the concurrence and find that the dynamic of non-Markovian entanglement concurrence C(rho)(t) at temperature k(B)T = 0 is different from the k(B)T > 0 case. We find that 'entanglement sudden death' (ESD) depends on the initial state when kBT = 0, otherwise the concurrence always disappears at a finite time when kBT > 0, which means that the ESD must happen. The main result of this paper is that the non-Markovian entanglement dynamic is fundamentally different from the Markovian one. In the Markovian channel, entanglement decays exponentially and vanishes only asymptotically, but in the non-Markovian channel the concurrence C(rho)(t) oscillates, especially in the high temperature case. Then an open-loop controller adjusted by the temperature is proposed to control the entanglement and prolong the ESD time. |
| 资助项目 | National Natural Science Foundation of China[60774099] ; National Natural Science Foundation of China[60821091] ; Chinese Academy of Sciences[KJCX3-SYW-S01] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000264505200009 |
| 出版者 | IOP PUBLISHING LTD |
| 源URL | [http://ir.amss.ac.cn/handle/2S8OKBNM/8087]  |
| 专题 | 系统科学研究所 |
| 通讯作者 | Cui, Wei |
| 作者单位 | 1.Chinese Acad Sci, Acad Math & Syst Sci, Inst Syst Sci, Key Lab Syst & Control, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China |
| 推荐引用方式 GB/T 7714 | Cui, Wei,Xi, Zairong,Pan, Yu. Non-Markovian entanglement dynamics between two coupled qubits in the same environment[J]. JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL,2009,42(15):13. |
| APA | Cui, Wei,Xi, Zairong,&Pan, Yu.(2009).Non-Markovian entanglement dynamics between two coupled qubits in the same environment.JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL,42(15),13. |
| MLA | Cui, Wei,et al."Non-Markovian entanglement dynamics between two coupled qubits in the same environment".JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL 42.15(2009):13. |
入库方式： OAI收割
来源：数学与系统科学研究院
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