Broadcasting of entanglement and universal quantum cloners

Details Broadcasting of entanglement and universal quantum cloners Broadcasting of entanglement and universal quantum cloners

1999-02-24

arxiv.org/abs/quant-ph/9902073v3

Phys.Rev. A60 (1999) 3296

Physics

Quantum Physics

8 pages, Latex,final version, to appear in Physical Review A

Scientific paper

10.1103/PhysRevA.60.3296

We study broadcasting of entanglement where we use universal quantum cloners (in general less optimal) to perform local cloning operations. We show that there is a lower bound on the fidelity of the universal quantum cloners that can be used for broadcasting. We prove that an entanglement is optimally broadcast only when optimal quantum cloners are used for local copying. We also show that broadcasting of entanglement into more than two entangled pairs is forbidden using only local operations.

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