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    Optimal Feedback Scheme and Universal Time Scaling for Hamiltonian Parameter Estimation (2015)
    American Physical Society (APS)
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    Publication Date: 2015-09-10
    Description: Author(s): Haidong Yuan and Chi-Hang Fred Fung Time is a valuable resource and it is expected that a longer time period should lead to better precision in Hamiltonian parameter estimation. However, recent studies in quantum metrology have shown that in certain cases more time may even lead to worse estimations, which puts this intuition into que… [Phys. Rev. Lett. 115, 110401] Published Tue Sep 08, 2015
    Keywords: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Fidelity and Fisher information on quantum channels (2017)
    Institute of Physics (IOP)
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    Publication Date: 2017-11-29
    Description: The fidelity function for quantum states has been widely used in quantum information science and frequently arises in the quantification of optimal performances for the estimation and distinguishing of quantum states. A fidelity function for quantum channels is expected to have the same wide applications in quantum information science. In this paper we propose a fidelity function for quantum channels and show that various distance measures on quantum channels can be obtained from this fidelity function; for example, the Bures angle and the Bures distance can be extended to quantum channels via this fidelity function. We then show that the distances between quantum channels lead naturally to a quantum channel Fisher information which quantifies the ultimate precision limit in quantum metrology; the ultimate precision limit can thus be seen as a manifestation of the distances between quantum channels. We also show that the fidelity of quantum channels provides a unified framework ...
    Electronic ISSN: 1367-2630
    Topics: Physics
    Published by Institute of Physics (IOP)
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  • 3
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    Quantum metrology matrix (2017)
    American Physical Society (APS)
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    Publication Date: 2017-07-08
    Description: Author(s): Haidong Yuan and Chi-Hang Fred Fung Various strategies exist in quantum metrology, such as with or without ancillary system, with a fixed or optimized measurement, with or without monitoring the environment, etc. Different set of tools are usually needed for different strategies. In this article, we provide a unified framework for the... [Phys. Rev. A 96, 012310] Published Fri Jul 07, 2017
    Keywords: Quantum information
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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