Photon pairs have become an important resource for quantum communication. Lately, effort has been concentrated on generating those pairs in waveguiding structures to avoid collection and insertion losses. For instance, photon pair sources based on parametric fluorescence in periodically poled lithium niobate waveguides or on four-wave mixing in silica fibre have been extensively studied. In 1999, G. Bonfrate et al. reported the observation of parametric fluorescence in periodically poled D-shape silica fibre [1], which suggests another promising photon pair source. Here we report the observation of photon pair generation in periodically poled twin-hole silica fibre. Compared with periodically poled D-shape fibres, twin-hole fibres have important advantages: direct splicing to standard fibres is possible; as well as periodic poling technology compatible with tens of centimetres of interaction length, thus potentially ensuring higher conversion.
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