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  • Replacing quantum feedback with open-loop control and quantum filtering

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    Author(s)
    Combes, Joshua
    Wiseman, Howard M
    Scott, AJ
    Griffith University Author(s)
    Wiseman, Howard M.
    Combes, Joshua LA.
    Scott, Andrew J.
    Year published
    2010
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    Abstract
    Feedback control protocols can stabilize and enhance the operation of quantum devices, however, unavoidable delays in the feedback loop adversely affect their performance. We introduce a quantum control methodology, combining open-loop control with quantum filtering, which is not constrained by feedback delays. For the problems studied (rapid purification and rapid measurement) we analytically derive lower bounds on the control performance that are comparable with the best corresponding bounds for feedback protocols.Feedback control protocols can stabilize and enhance the operation of quantum devices, however, unavoidable delays in the feedback loop adversely affect their performance. We introduce a quantum control methodology, combining open-loop control with quantum filtering, which is not constrained by feedback delays. For the problems studied (rapid purification and rapid measurement) we analytically derive lower bounds on the control performance that are comparable with the best corresponding bounds for feedback protocols.
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    Journal Title
    Physical Review A (Atomic, Molecular and Optical Physics)
    Volume
    81
    Issue
    2
    DOI
    https://doi.org/10.1103/PhysRevA.81.020301
    Copyright Statement
    © 2010 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Mathematical sciences
    Physical sciences
    Quantum information, computation and communication
    Chemical sciences
    Publication URI
    http://hdl.handle.net/10072/33182
    Collection
    • Journal articles

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