Thomas Meany, Michael Delanty, Simon Gross, Graham D. Marshall, M. J. Steel, Michael J. Withford
We demonstrate three and four input multiports in a three dimensional glass platform, fabricated using the femtosecond laser direct-write technique. Hong-Ou-Mandel (HOM) interference is observed and a full quantum characterisation is performed, obtaining two photon correlation matrices for all combinations of input and output ports. For the three-port case, the quantum visibilities are accurately predicted solely from measurement of the classical coupling ratios.
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http://arxiv.org/abs/1208.4154
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