Optimal Cloning of Pure States, Judging Single Clones

Details Optimal Cloning of Pure States, Judging Single Clones Optimal Cloning of Pure States, Judging Single Clones

1998-07-03

arxiv.org/abs/quant-ph/9807010v1

J.Math.Phys. 40 (1999) 3283-3299

Physics

Quantum Physics

16 Pages, REVTeX

Scientific paper

We consider quantum devices for turning a finite number N of d-level quantum systems in the same unknown pure state \sigma into M>N systems of the same kind, in an approximation of the M-fold tensor product of the state \sigma. In a previous paper it was shown that this problem has a unique optimal solution, when the quality of the output is judged by arbitrary measurements, involving also the correlations between the clones. We show in this paper, that if the quality judgement is based solely on measurements of single output clones, there is again a unique optimal cloning device, which coincides with the one found previously.

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