https://doi.org/10.1140/epjd/e2010-10337-2
Entanglement preparation using symmetric multiports
1
Department of Physics, FNSPE, Czech Technical University in Prague, Břehova 7, Stare Město, 11519 Praha, Czech Republic
2
SUPA, Department of Physics, School of EPS, Heriot-Watt University, Edinburgh, UK
3
Department of Quantum Optics and Quantum Information, Research Institute for Solid State Physics and Optics,
Hungarian Academy of Sciences, Konkoly-Thege Miklos ut 29-33, 1121 Budapest, Hungary
Corresponding author: a thomas.brougham@gmail.com
Received:
7
June
2010
Revised:
11
October
2010
Published online:
3
December
2010
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.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010