20 May 2016 Application of a Lyot filter plate in discrete frequency entanglement
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Non-degenerate frequency entanglement has been reported in several recent experiments, since its original observation with Spontaneous Parametric Down-conversion. We report on a configuration based on a Lyot plate, which overcomes shortcomings of prior work by avoiding post-selection and state projection losses. This makes the process suitable, in principle, for use in efficient QKD protocols based on photon pairs entangled in frequency at remote locations.
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Reinhard Erdmann, David Hughes, "Application of a Lyot filter plate in discrete frequency entanglement", Proc. SPIE 9873, Quantum Information and Computation IX, 98730A (20 May 2016); doi: 10.1117/12.2229368; https://doi.org/10.1117/12.2229368

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