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International Conference on Quantum Information

Quantum information processing with optical fibres

Jérémie Fulconis, Alex S. Clark, M. Halder, Jeremy L. O’Brien, John Rarity, Chunhe Xiong, W. J. Wadsworth

Published Jan 1, 2008• 0 citations
Publisher

Abstract

We demonstrate a fibre implementation of a Controlled-NOT gate using a fibre source of heralded single photons and three partially polarising couplers. We also investigate a new phase-matching scheme for pure state single photon generation.
DOI
10.1364/icqi.2008.qwb5

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We report an experimental demonstration of a quantum controlled-NOT gate constructed entirely in optical fiber and operating on polarization-encoded single-photon qubits. We operated this gate using two heralded optical fiber single-photon sources and found an average logical fidelity of 90% and an average process fidelity of $0.83\ensuremath{\le}\overline{F}\ensuremath{\le}0.91$. On the basis of a simple model we are able to conclude that imperfections are primarily due to the photon sources, meaning that the gate itself works with very high fidelity. Such all fiber quantum information processing will likely have important applications in future quantum networks.