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题名: Weak measurement of qubit oscillations with strong response detectors: Violation of the fundamental bound imposed on linear detectors
作者: Jiao HJ;  Li F;  Wang SK;  Li XQ
发表日期: 2009
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.
KOS主题词: Quantum theory;  Optical detectors;  Light meters;  Biocomputers;  Quantum theory
刊名: PHYSICAL REVIEW B
专题: 中国科学院半导体研究所(2009年前)_期刊论文

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Jiao HJ ; Li F ; Wang SK ; Li XQ .Weak measurement of qubit oscillations with strong response detectors: Violation of the fundamental bound imposed on linear detectors ,PHYSICAL REVIEW B,2009 ,79(7):Art. No. 075320
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