(1) Department of Physics, Huaiyin Teachers College, Huaian, 223001, Jiangsu, P.R. China;(2) CCAST (World Laboratory), Beijing, P.O. Box 8730, 100080, P.R. China
Abstract:
We propose a protocol where one can realize quantum cloning of an unknown two-particle entangled state and its orthogonal-complement
state with assistance offered by a state preparer. The first stage of the protocol requires usual teleportation using a (or
two) four-particle entangled state(s) as quantum channel(s). In the second stage of the protocol, with the assistance (through
a two-particle projective measurement) of the preparer, the perfect copies and complement copies of an unknown state can be
produced.