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Phys Rev Lett. 2004 Aug 27;93(9):093601. Epub 2004 Aug 25.

Efficient conditional preparation of high-fidelity single photon states for fiber-optic quantum networks.

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  • 1Clarendon Laboratory, Oxford University, Parks Road, Oxford, OX1 3PU, United Kingdom.


Highly correlated photons or, accordingly, high-fidelity single-photon states are a prerequisite for closing detection loopholes in experimental tests of local realism and implementing scalable linear optical quantum computation. We demonstrate a parametric down-conversion source exhibiting a conditional detection efficiency of 51% (with corresponding preparation efficiency of 85%) and extraordinarily high detection rates of up to 8.5 x 10(5) coincidences/(s mW). We exploit a novel type-II phase matching configuration in a microstructured waveguide in conjunction with an ultrashort pump.

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