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Parametric down-conversion and optical quantum gates: two's company, four's a crowd

Abstract : We show that the primary cause of errors in a broad class of optical quantum-logic gates are due to the higherorder 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.
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https://hal-iogs.archives-ouvertes.fr/hal-00569543
Contributor : Philippe Grangier <>
Submitted on : Friday, February 25, 2011 - 1:49:16 PM
Last modification on : Wednesday, September 16, 2020 - 5:42:35 PM

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Marco Barbieri, T.J. Weinhold, B.P. Lanyon, A. Gilchrist, K.J. Resch, et al.. Parametric down-conversion and optical quantum gates: two's company, four's a crowd. Journal of Modern Optics, Taylor & Francis, 2009, 56, pp.209-214. ⟨10.1080/09500340802337374⟩. ⟨hal-00569543⟩

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