Weak measurement of qubit oscillations with strong response detectors: Violation of the fundamental bound imposed on linear detectors
文献类型：期刊论文
| 作者 | Jiao HJ ; Li F ; Wang SK ; Li XQ |
| 刊名 | physical review b
 |
| 出版日期 | 2009 |
| 卷号 | 79期号:7页码:art. no. 075320 |
| 关键词 | mesoscopic systems photodetectors quantum computing single electron transistors |
| ISSN号 | 1098-0121 |
| 通讯作者 | jiao hj chinese acad sci inst semicond state key lab superlattices & microstruct pob 912 beijing 100083 peoples r china. e-mail address: xqli@red.semi.ac.cn |
| 中文摘要 | 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. |
| 学科主题 | 半导体物理 |
| 收录类别 | SCI |
| 资助信息 | national natural science foundation of china 60425412 90503013major state basic research project 2006cb921201 this work was supported by the national natural science foundation of china under grants no. 60425412 and no. 90503013 and the major state basic research project under grant no. 2006cb921201. |
| 语种 | 英语 |
| 公开日期 | 2010-03-08 |
| 源URL | [http://ir.semi.ac.cn/handle/172111/7315]  |
| 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 | Jiao HJ,Li F,Wang SK,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):art. no. 075320. |
| APA | Jiao HJ,Li F,Wang SK,&Li XQ.(2009).Weak measurement of qubit oscillations with strong response detectors: Violation of the fundamental bound imposed on linear detectors.physical review b,79(7),art. no. 075320. |
| MLA | Jiao HJ,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):art. no. 075320. |
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来源：半导体研究所
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