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Optimal Measurement on Noisy Quantum Systems

Source: Phys. Rev. Lett. 104, 020401 (2010); doi:10.1103/PhysRevLett.104.020401

Published 15 January 2010

PACS
  • 03.65.Yz
    Decoherence; open systems; quantum statistical methods
  • 03.65.Fd
    Algebraic methods in quantum mechanics
  • 03.65.Ta
    Foundations of quantum mechanics; measurement theory
  • 03.67.-a
    Quantum information
  • YEAR: 2010
PUBLICATION DATA
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Yu Watanabe,1 Takahiro Sagawa,1 and Masahito Ueda1,2
1Department of Physics, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
2ERATO Macroscopic Quantum Control Project, JST, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
We identify the optimal measurement for obtaining information about the original quantum state after the state to be measured has undergone partial decoherence due to noise. We quantify the information that can be obtained by the measurement in terms of the Fisher information and find its value for the optimal measurement. We apply our results to a quantum control scheme based on a spin-boson model. ©2010 The American Physical Society
History: Received 27 August 2009; published 15 January 2010
Permalink: http://link.aps.org/abstract/PRL/v104/e020401
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