Bounds for state-dependent quantum cloning

Details Bounds for state-dependent quantum cloning Bounds for state-dependent quantum cloning

2002-09-16

arxiv.org/abs/quant-ph/0209094v1

Physics

Quantum Physics

13 pages, 1 figure, to appear in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.66.052301

Due to the no-cloning theorem, the unknown quantum state can only be cloned approximately or exactly with some probability. There are two types of cloners: universal and state-dependent cloner. The optimal universal cloner has been found and could be viewed as a special state-dependent quantum cloner which has no information about the states. In this paper, we investigate the state-dependent cloning when the state-set contains more than two states. We get some bounds of the global fidelity for these processes. This method is not dependent on the number of the states contained in the state-set. It is also independent of the numbers of copying.

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