Guided-wave parametric downconversion with a transverse pump is a versatile means to generate a wide range of two-photon states. We propose and compare some microcavity-based schemes for the generation of counterpropagating photon pairs, and we experimentally demonstrate a bright source emitting 1.2×10−11 pairs/pump photon for a 1.8 mm long waveguide. These results are promising for integrated quantum information technology.
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Orieux et al. (2010) studied this question.
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