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Quantum cloning machines with phase-conjugate input modes

par Cerf, Nicolas ;Iblisdir, Sofyan
Référence Physical Review Letters, 87, page (247903)
Publication Publié, 2001

Article révisé par les pairs

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Résumé :

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-conjugate clones at no cost. For well chosen ratios N'/N, this machine is shown to provide better cloning fidelities than the standard (N+N')-->M cloner. The special cases of the optimal balanced cloner (N = N') and optimal measurement (M = infinity) are investigated.