Eur. Phys. J. D (2014) 68: 365
https://doi.org/10.1140/epjd/e2014-50255-7

Regular Article

The roles of quantum correlations in quantum cloning

School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, P.R. China

^a e-mail: quaninformation@sina.com

Received: 29 March 2014
Received in final form: 4 June 2014
Published online: 4 December 2014

Abstract

In this paper, we study the entanglement and quantum discord of the output modes in the unified 1 → 2 state-dependent cloning and probabilistic quantum cloning. The tripartite entanglement among the output modes and the quantum cloning machine is also considered. We find that the roles of the quantum correlations including the bipartite and tripartite entanglement and quantum discord strongly depend on the quantum cloning machines as well as the cloned state. In particular, it is found that this quantum cloning scheme can be realizable even without any quantum correlation.