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题名: Quantum State Transfer in Engineered Spin Chain under Influence of Spatially Distributed Environment
作者: Zhou Lan ;  Lu Jing ;  Shi Tao
刊名: COMMUNICATIONS IN THEORETICAL PHYSICS
出版日期: 2009
卷号: 52, 期号:2, 页码:226-234
关键词: ENTANGLEMENT GENERATION ;  INFORMATION ;  SYSTEMS
学科分类: Physics
通讯作者: Zhou, L , Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China
部门归属: [Zhou, L; Lu, J] Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China; [Shi, T] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China
英文摘要: It has been shown that a quantum state could be perfectly transferred via a spin chain with engineered "always-on interaction". In this paper, we study a more realistic problem for such a quantum state transfer (QST) protocol, how the efficacy of QST is reduced by the quantum decoherence induced by a spatially distributed environment. Here, the environment is universally modeled as a bath of fermions located in different positions. By making use of the irreducible tensor method in angular momentum theory, we investigate the effect of environment on the efficiency of QST for both cases at zero and finite temperatures. We not only show the generic exponential decay of QST efficiency as the number of sites increase, but also find some counterintuitive effect, the QST can be enhanced as temperature increases in some cases.
资助者: NSFC[10775048, 10704023]; NFRPC[2007CB925204]; New Century Excellent Talents in University[NCET-08-0682]; Scientific Research Fund of Hunan Provincial Education Department of China[07C579]
收录类别: SCI
WOS记录号: WOS:000269337600007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5258
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Zhou Lan,Lu Jing,Shi Tao. Quantum State Transfer in Engineered Spin Chain under Influence of Spatially Distributed Environment[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2009,52(2):226-234.
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