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摘要
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.
- 出版日期2007-8-28
- 单位湖南师范大学
