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.
© 2005 Chinese Optics Letters
Youbang Zhan, "A scheme for assisted cloning of a two-particle entangled state via GHZ class states," Chin. Opt. Lett. 3, S286-S289 (2005)