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	Weak measurement of qubit oscillations with strong response detectors: violation of the fundamental bound imposed on linear detectors
	Jiao, HuJun1; Li, Feng1; Wang, Shi-Kuan2; Li, Xin-Qi1,3
刊名	Physical review b
	2009-02-01
卷号	79期号:7页码:5
关键词	Mesoscopic systems Photodetectors Quantum computing Single electron transistors
ISSN号	1098-0121
DOI	10.1103/physrevb.79.075320
通讯作者	Jiao, hujun()
英文摘要	Qubit measurement by mesoscopic charge detectors has received great interest in the community of mesoscopic transport and solid-state quantum computation, and some controversial issues still remain unresolved. in this work, we revisit the continuous weak measurement of a solid-state qubit by single electron transistors (sets) in nonlinear-response regime. for two set models typically used in the literature, we find that the signal-to-noise ratio can violate the universal upper bound "4," which is imposed quantum mechanically on linear-response detectors. this different result can be understood by means of the cross correlation of the detector currents by viewing the two junctions of the single set as two detectors. possible limitation of the potential-scattering approach to this result is also discussed.
WOS研究方向	Physics
WOS类目	Physics, Condensed Matter
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000263815800076
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2427564
专题	半导体研究所
通讯作者	Jiao, HuJun
作者单位	1.Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 100083, Peoples R China 2.Beijing Normal Univ, Dept Chem, Beijing 100875, Peoples R China 3.Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Jiao, HuJun,Li, Feng,Wang, Shi-Kuan,et al. Weak measurement of qubit oscillations with strong response detectors: violation of the fundamental bound imposed on linear detectors[J]. Physical review b,2009,79(7):5.
APA	Jiao, HuJun,Li, Feng,Wang, Shi-Kuan,&Li, Xin-Qi.(2009).Weak measurement of qubit oscillations with strong response detectors: violation of the fundamental bound imposed on linear detectors.Physical review b,79(7),5.
MLA	Jiao, HuJun,et al."Weak measurement of qubit oscillations with strong response detectors: violation of the fundamental bound imposed on linear detectors".Physical review b 79.7(2009):5.

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