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

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Barbieri, M.
Weinhold, Till
Lanyon, B.
Gilchrist, A.
Resch, K.
Almeida, M.
White, A.
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2009
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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 considering alternative schemes based on weak nonlinearities to see if they are more resilient to this degradation.

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Journal of Modern Optics

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56

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2-Mar

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Atomic, molecular and optical physics

Atomic, molecular and optical physics not elsewhere classified

Quantum physics

Nanotechnology

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