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›› 2010, Vol. 27 ›› Issue (5): 590-598.DOI: 10.7523/j.issn.2095-6134.2010.5.003

• Research Articles • Previous Articles     Next Articles

Weak measurement-based decoherence control of quantum systems

LOU Yue-Sheng, CONG Shuang   

  1. Department of Automation, University of Science and Technology of China, Hefei 230027,China
  • Received:2009-09-15 Revised:2010-04-19 Online: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) 

Abstract:

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.

Key words: quantum system control, weak measurement, states evolvement, decoherence control

CLC Number: