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  • Parametric downconversion and optical quantum gates: two’s company, four’s a crowd

    Author(s)
    Barbieri, M.
    Weinhold, Till
    Lanyon, B.
    Gilchrist, A.
    Resch, K.
    Almeida, M.
    White, A.
    Griffith University Author(s)
    Weinhold, Till
    Year published
    2009
    Metadata
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    Abstract
    We show that the primary cause of errors in a broad class of optical quantum-logic gates are due to the higher-order photon terms in parametric downconversion sources. A model describing real-life imperfections in these entangling gates is presented and tested in an experiment where we entangle dependent photons from the same downconversion source using a controlled-z gate, and measure the state tomographically. We find good agreement between the modelled and measured results. Our investigations demonstrate that, although small, these noise terms are amplified by the intrinsic non-determinism of the gates. It is worth ...
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    We show that the primary cause of errors in a broad class of optical quantum-logic gates are due to the higher-order photon terms in parametric downconversion sources. A model describing real-life imperfections in these entangling gates is presented and tested in an experiment where we entangle dependent photons from the same downconversion source using a controlled-z gate, and measure the state tomographically. We find good agreement between the modelled and measured results. Our investigations demonstrate that, although small, these noise terms are amplified by the intrinsic non-determinism of the gates. It is worth considering alternative schemes based on weak nonlinearities to see if they are more resilient to this degradation.
    View less >
    Journal Title
    Journal of Modern Optics
    Volume
    56
    Issue
    2-3
    DOI
    https://doi.org/10.1080/09500340802337374
    Subject
    Atomic, molecular and optical physics
    Atomic, molecular and optical physics not elsewhere classified
    Quantum physics
    Nanotechnology
    Publication URI
    http://hdl.handle.net/10072/30578
    Collection
    • Journal articles

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