Entanglement preparation using symmetric multiports

Brougham, T. and Kost'ak, V. and Jex, I. and Andersson, E. and Kiss, T. (2011) Entanglement preparation using symmetric multiports. European Physical Journal D: Atomic, Molecular, Optical and Plasma Physics, 61 (1). pp. 231-236. ISSN 1434-6060

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We investigate the entanglement produced by a multi-path interferometer that is composed of two symmetric multiports, with phase shifts applied to the output of the first multiport. Particular attention is paid to the case when we have a single photon entering the interferometer. For this situation we derive a simple condition that characterizes the types of entanglement that one can generate. We then show how one can use the results from the single-photon case to determine what kinds of multi-photon entangled states one can prepare using the interferometer.