Criterion for remote clock synchronization with Heisenberg-scaling accuracy

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	Criterion for remote clock synchronization with Heisenberg-scaling accuracy
	Zhang, YL ; Zhang, YR ; Mu, LZ ; Fan, H
刊名	PHYSICAL REVIEW A
	2013
卷号	88 期号:5
ISSN号	1050-2947
通讯作者	Zhang, YL (reprint author), Peking Univ, Sch Phys, Beijing 100871, Peoples R China.
中文摘要	We propose a quantum method to judge whether two spatially separated clocks have been synchronized within a specific accuracy sigma. If the measurement result of the experiment is clearly a nonzero value, the time difference between two clocks is smaller than sigma; otherwise, the difference is beyond sigma. Upon sharing the 2N-qubit bipartite maximally entangled state in this scheme, the accuracy of judgment can be enhanced to sigma similar to pi/[omega(N + 1)]. This criterion is consistent with Heisenberg scaling, which can be considered as the beating standard quantum limit; moreover, the unbiased estimation condition is not necessary. In particular, we demonstrate that this scheme is still feasible when suffering the loss of qubits.
资助信息	973 Program [2010CB922904]; NSFC [11175248]; NFFTBS [J1030310, J1103205]; Chinese Academy of Sciences; Chun-Tsung scholar fund of Peking University
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/311004/56849]
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	Zhang, YL,Zhang, YR,Mu, LZ,et al. Criterion for remote clock synchronization with Heisenberg-scaling accuracy[J]. PHYSICAL REVIEW A,2013,88(5).
APA	Zhang, YL,Zhang, YR,Mu, LZ,&Fan, H.(2013).Criterion for remote clock synchronization with Heisenberg-scaling accuracy.PHYSICAL REVIEW A,88(5).
MLA	Zhang, YL,et al."Criterion for remote clock synchronization with Heisenberg-scaling accuracy".PHYSICAL REVIEW A 88.5(2013).