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The group theoretical aspect of the description of passive lossless optical four-ports (beam splitters) is revisited. It is shown through an example, that this approach can be useful in understanding interferometric schemes where a low number of photons interfere. The formalism is extended to passive lossless optical six-ports, their SU(3)-theory is outlined.
Matyas Koniorczyk andJozsef Janszky
"Photon number conservation and photon interference", Proc. SPIE 4888, First International Workshop on Classical and Quantum Interference, (22 July 2002); https://doi.org/10.1117/12.475872
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Matyas Koniorczyk, Jozsef Janszky, "Photon number conservation and photon interference," Proc. SPIE 4888, First International Workshop on Classical and Quantum Interference, (22 July 2002); https://doi.org/10.1117/12.475872