收稿日期: 2009-09-15
修回日期: 2010-04-19
网络出版日期: 2010-09-15
基金资助
Supported by the National Natural Science Foundation of China (60774098), the National Key Basic Research Program (2006CB922004), and the USTC Initiative Foundation (KD2007045)
Weak measurement-based decoherence control of quantum systems
Received date: 2009-09-15
Revised date: 2010-04-19
Online published: 2010-09-15
Supported by
Supported by the National Natural Science Foundation of China (60774098), the National Key Basic Research Program (2006CB922004), and the USTC Initiative Foundation (KD2007045)
楼越升 , 丛爽 . 基于弱测量的量子系统消相干控制[J]. 中国科学院大学学报, 2010 , 27(5) : 590 -598 . DOI: 10.7523/j.issn.2095-6134.2010.5.003
Properties and potential applications of weak measurement are investigated. First, a kind of positive operator-valued measurement is defined, and a sufficient condition is deduced for weak measurement from the view of linear normed space. Secondly, the applicability of weak measurement is discussed. It is shown that weak measurement is applicable not only to a set of identical quantum systems, but also to a single quantum system if any measurement operator can be selectively implemented. Finally, the effects of weak measurement on different quantum systems are studied. For a set of identical quantum systems, weak measurement affects states as a dephasing process. However, for a two-level single quantum system, it can be used to inhibit dephasing and to depolarization processes.
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