We demonstrate generation of hyperentangled (time-bin and polarization) photon pairs via four-wave mixing in a microstructure-fiber Sagnac interferometer. The two-photon interference visibility in the time-bin (polarization) degree of freedom is 88%±2% (84%±1%) without subtraction of accidental coincidences, and Bell's inequality is violated by 27 standard deviations at a 10.3em0exkHz coincidence rate.
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Chen et al. (2008) studied this question.
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