Optimal transfer of an unknown state via a bipartite quantum operation

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	Optimal transfer of an unknown state via a bipartite quantum operation
	Liu, Y ; Guo, Y ; Zhou, DL
刊名	EPL
	2013
卷号	102 期号:5
ISSN号	0295-5075
通讯作者	Liu, Y (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
中文摘要	A fundamental task in quantum information science is to transfer an unknown state from particle A to particle B (often in remote space locations) by using a bipartite quantum operation epsilon(AB). We suggest the power of epsilon(AB) for quantum state transfer (QST) to be the maximal average probability of QST over the initial states of particle B and the identifications of the state vectors between A and B. We find the QST power of a bipartite quantum operations satisfies four desired properties between two d-dimensional Hilbert spaces. When A and B are qubits, the analytical expressions of the QST power is given. The numerical result on a QST scheme via a quantum wire shows the necessity to optimize the average fidelity. In particular, we obtain the exact results of the QST power for a general two-qubit unitary transformation, and we find a necessary and sufficient condition for the two-qubit unitary gates with perfect QST. Copyright (c) EPLA, 2013
资助信息	NSF of China [10975181, 11175247, 11105020]; NKBRSF of China [2012CB922104]
语种	英语
公开日期	2014-01-16
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/57299]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Liu, Y,Guo, Y,Zhou, DL. Optimal transfer of an unknown state via a bipartite quantum operation[J]. EPL,2013,102(5).
APA	Liu, Y,Guo, Y,&Zhou, DL.(2013).Optimal transfer of an unknown state via a bipartite quantum operation.EPL,102(5).
MLA	Liu, Y,et al."Optimal transfer of an unknown state via a bipartite quantum operation".EPL 102.5(2013).