Quantum measurement of a solid-state qubit: A unified quantum master equation approach

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	Quantum measurement of a solid-state qubit: A unified quantum master equation approach
	Li, XQ ; Zhang, WK ; Cui, P ; Shao, JS ; Ma, ZS ; Yan, YJ
刊名	physical review b
	2004
卷号	69 期号:8 页码:art.no.085315
关键词	DOT
ISSN号	1098-0121
通讯作者	li, xq, chinese acad sci, inst semicond, natl lab superlattices & microstruct, pob 912, beijing 100083, peoples r china.
中文摘要	quantum measurement of a solid-state qubit by a mesoscopic detector is of fundamental interest in quantum physics and an essential issue in quantum computing. in this work, by employing a unified quantum master equation approach constructed in our recent publications, we study the measurement-induced relaxation and dephasing of the coupled-quantum-dot states measured by a quantum-point contact. our treatment pays particular attention on the detailed-balance relation, which is a consequence of properly accounting for the energy exchange between the qubit and detector during the measurement process. as a result, our theory is applicable to measurement at arbitrary voltage and temperature. both numerical and analytical results for the qubit relaxation and dephasing are carried out, and important features are highlighted in concern with their possible relevance to future experiments.
学科主题	半导体物理
收录类别	SCI
语种	英语
公开日期	2010-03-09
内容类型	期刊论文
源URL	[http://ir.semi.ac.cn/handle/172111/8142]
专题	半导体研究所_中国科学院半导体研究所（2009年前）
推荐引用方式 GB/T 7714	Li, XQ,Zhang, WK,Cui, P,et al. Quantum measurement of a solid-state qubit: A unified quantum master equation approach[J]. physical review b,2004,69(8):art.no.085315.
APA	Li, XQ,Zhang, WK,Cui, P,Shao, JS,Ma, ZS,&Yan, YJ.(2004).Quantum measurement of a solid-state qubit: A unified quantum master equation approach.physical review b,69(8),art.no.085315.
MLA	Li, XQ,et al."Quantum measurement of a solid-state qubit: A unified quantum master equation approach".physical review b 69.8(2004):art.no.085315.