Phase-Conjugated Inputs Quantum Cloning Machines

Details Phase-Conjugated Inputs Quantum Cloning Machines Phase-Conjugated Inputs Quantum Cloning Machines

2001-02-15

arxiv.org/abs/quant-ph/0102077v1

Phys. Rev. Lett. 87, 247903 (2001)

Physics

Quantum Physics

4 pages (RevTex), 2 figures

Scientific paper

10.1103/PhysRevLett.87.247903

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.

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