Entanglement preparation using symmetric multiports
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- Brougham, T., Košták, V., Jex, I. et al. Eur. Phys. J. D (2011) 61: 231. doi:10.1140/epjd/e2010-10337-2
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.