This letter reports a Hong-Ou-Mandel experiment using two photon pairs in the 1.5μm band that are generated in two independent dispersion shifted fibers. A quantum interference with 53% visibility was observed. Thanks to the narrow bandwidth of the photon pairs, the required accuracy for photon arrival time adjustment was relaxed to a few millimeters, which is a great advantage for an application to a quantum relay.
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Hiroki Takesue (2007) studied this question.
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