Non-Markovian entanglement dynamics between two coupled qubits in the same environment

doi:10.1088/1751-8113/42/15/155303

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	Non-Markovian entanglement dynamics between two coupled qubits in the same environment
	Cui, Wei 1,2; Xi, Zairong1 ; Pan, Yu 1,2
	2009-04-17
发表期刊	JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
ISSN	1751-8113
卷号	42 期号:15 页码:13
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.
DOI	10.1088/1751-8113/42/15/155303
语种	英语
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
WOS类目	Physics, Multidisciplinary ; Physics, Mathematical
WOS记录号	WOS:000264505200009
出版者	IOP PUBLISHING LTD
引用统计
文献类型	期刊论文
条目标识符	http://ir.amss.ac.cn/handle/2S8OKBNM/8088
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.