Physics Letters A 373, 2601–2604 (2009)

SCI

Generation of free-travelling four-mode cluster-type entangled coherent states

Nguyen Ba An, Tran Thai Hoa

A new scheme is proposed to generate free-travelling four-mode cluster-type entangled coherent states. Compared with other previously proposed schemes ours is very simple in execution using only one π- cross-Kerr medium, two 50 :50 beam-splitters and two π/2-phase-shifters. Despite the setup simplicity, our scheme, unlike the others which are all probabilistic, is efficient with 100% success probability since no measurements are involved at all.