An All Optical Fibre Quantum Controlled-NOT Gate

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We report the first experimental demonstration of an optical controlled-NOT gate constructed entirely in fibre.

• We operate the gate using two heralded optical fibre single photon sources and find an average logical fidelity of 90% and an average process fidelity of 0.83<F<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.