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  • Improving Metrological Limit via Weak Measurement and Quantum Measurement Reversal

    Author(s)
    Liu, Lijun
    Qi, Bo
    Cheng, Shuming
    Xi, Zairong
    Griffith University Author(s)
    Cheng, Shuming
    Year published
    2015
    Metadata
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    Abstract
    Quantum parameter estimation is of fundamental importance in physics. Quantum resources, involving for instance entangled probes, offer a significant improvement in estimation precision over classical strategies for closed quantum systems. However, when noises such as decoherence are taken into account, the quantum gain may be jeopardized. In this paper, we show how the amplitude-damping decoherence degrades the estimation precision from the Heisenberg limit to the standard limit with the initial Greenberger-Horne-Zeilinger (GHZ) state being employed and demonstrate that the method of weak measurement and quantum measurement ...
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    Quantum parameter estimation is of fundamental importance in physics. Quantum resources, involving for instance entangled probes, offer a significant improvement in estimation precision over classical strategies for closed quantum systems. However, when noises such as decoherence are taken into account, the quantum gain may be jeopardized. In this paper, we show how the amplitude-damping decoherence degrades the estimation precision from the Heisenberg limit to the standard limit with the initial Greenberger-Horne-Zeilinger (GHZ) state being employed and demonstrate that the method of weak measurement and quantum measurement reversal can recover this estimation precision to the Heisenberg limit, even though at the price of a very low success probability.
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    Conference Title
    34th Chinese Control Conference
    DOI
    https://doi.org/10.1109/ChiCC.2015.7260956
    Subject
    Quantum physics not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/125336
    Collection
    • Conference outputs

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