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  • Experimental feedback control of quantum systems using weak measurements

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    Author(s)
    Gillett, GG
    Dalton, RB
    Lanyon, BP
    Almeida, MP
    Barbieri, M
    Pryde, GJ
    O'Brien, JL
    Resch, KJ
    Bartlett, SD
    White, AG
    Griffith University Author(s)
    Pryde, Geoff
    Year published
    2010
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    Abstract
    A goal of the emerging field of quantum control is to develop methods for quantum technologies to function robustly in the presence of noise. Central issues are the fundamental limitations on the available information about quantum systems and the disturbance they suffer in the process of measurement. In the context of a simple quantum control scenario-the stabilization of nonorthogonal states of a qubit against dephasing-we experimentally explore the use of weak measurements in feedback control. We find that, despite the intrinsic difficultly of implementing them, weak measurements allow us to control the qubit better ...
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    A goal of the emerging field of quantum control is to develop methods for quantum technologies to function robustly in the presence of noise. Central issues are the fundamental limitations on the available information about quantum systems and the disturbance they suffer in the process of measurement. In the context of a simple quantum control scenario-the stabilization of nonorthogonal states of a qubit against dephasing-we experimentally explore the use of weak measurements in feedback control. We find that, despite the intrinsic difficultly of implementing them, weak measurements allow us to control the qubit better in practice than is even theoretically possible without them. Our work shows that these more general quantum measurements can play an important role for feedback control of quantum systems.
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    Journal Title
    Physical Review Letters
    Volume
    104
    Issue
    8
    DOI
    https://doi.org/10.1103/PhysRevLett.104.080503
    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
    Quantum optics and quantum optomechanics
    Engineering
    Publication URI
    http://hdl.handle.net/10072/33225
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    • Journal articles

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