Physics Letters A 373
, 2601–2604 (2009)
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.