%0 Journal Article
%T Phase-Conjugated Inputs Quantum Cloning Machines
%A N. J. Cerf
%A S. Iblisdir
%J Physics
%D 2001
%I arXiv
%R 10.1103/PhysRevLett.87.247903
%X A quantum cloning machine is introduced that yields $M$ identical optimal clones from $N$ replicas of a coherent state and $N'$ replicas of its phase conjugate. It also optimally produces $M'=M+N'-N$ phase-conjugated clones at no cost. For well chosen input asymmetries $N'/(N+N')$, this machine is shown to provide better cloning fidelities than the standard $(N+N') \to M$ cloner. The special cases of the optimal balanced cloner ($N=N'$) and the optimal measurement ($M=\infty$) are investigated.
%U http://arxiv.org/abs/quant-ph/0102077v1