Near-deterministic generation of four-modeW-type entangled coherent states
Yu Guo, Le‐Man Kuang · Journal of Physics B Atomic Molecular and Optical Physics · 2007
In this paper, we propose an optical scheme to generate four-mode W -type entangled coherent states (ECSs) in free travelling optical fields by using a single-photon source, coherent state sources, beam splitters, photodetectors and cross-Kerr media. Our scheme consists of a symmetric optical setup in which there are two Mach–Zehnder interferometers in which each arm contains a cross-Kerr medium. We calculate the average fidelity of generated W -type ECSs, the success probability of producing four-mode W -type ECSs and the average fidelity of the generated four-mode W -type ECSs. It is indicated that our protocol is nearly deterministic.