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Experimental realization of maximum confidence quantum state discrimination for the extraction of quantum information

Mosley, P.J. and Croke, S. and Walmsley, I.A. and Barnett, S.M. (2006) Experimental realization of maximum confidence quantum state discrimination for the extraction of quantum information. Physical Review Letters, 97 (193601). 193601/1-193601/4. ISSN 0031-9007

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    Abstract

    We present the first experimental demonstration of the maximum confidence measurement strategy for quantum state discrimination. Applying this strategy to an arbitrary set of states assigns to each input state a measurement outcome which, when realized, gives the highest possible confidence that the state was indeed present. The theoretically optimal measurement for discriminating between three equiprobable symmetric qubit states is implemented in a polarization-based free-space interferometer. The maximum confidence in the measurement result is 2/3. This is the first explicit demonstration that an improvement in the confidence over the optimal minimum error measurement is possible for linearly dependent states.

    Item type: Article
    ID code: 6156
    Keywords: quantum, optics, physics, quantum state, qubit, quantum information, Optics. Light
    Subjects: Science > Physics > Optics. Light
    Department: Faculty of Science > Physics
    Related URLs:
    Depositing user: Miss Darcy Spiller
    Date Deposited: 16 May 2008
    Last modified: 16 Dec 2013 06:39
    URI: http://strathprints.strath.ac.uk/id/eprint/6156

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