Saleh Rahimi-Keshari, Matthew A. Broome, Robert Fickler, Alessandro Fedrizzi, Timothy C. Ralph, Andrew G. White
We introduce an efficient method for characterizing the unitary matrix describing a multi-mode linear photonic device. By using readily available single- and two-mode coherent states as probe states and measuring the intensities of the output coherent states, all the moduli and phases of the unitary matrix can be directly measured. We illustrate our method by characterising a $3{\times}3$ fused-fibre coupler and independently verify the results via non-classical two-photon interference.
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http://arxiv.org/abs/1210.6463
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