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

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dc.creatorLi, Xin-Qi
dc.creatorZhang, Wen-Kai
dc.creatorCui, Ping
dc.creatorShao, Jiushu
dc.creatorMa, Zhongshui
dc.creatorYan, YiJing
dc.date2003-09-25
dc.date.accessioned2026-07-07T02:53:46Z
dc.date.available2026-07-07T02:53:46Z
dc.descriptionQuantum 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 new features are highlighted in concern with their possible relevance to future experiments.
dc.description9 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0309574
dc.identifierhttp://arxiv.org/abs/cond-mat/0309574
dc.identifierPhys. Rev. B 69, 085315 (2004)
dc.identifierdoi:10.1103/PhysRevB.69.085315
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/22290
dc.subjectMesoscale and Nanoscale Physics
dc.titleQuantum measurement of a solid-state qubit: A unified quantum master equation approach revisited
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