Phase covariant quantum cloning

Details Phase covariant quantum cloning Phase covariant quantum cloning

1999-09-15

arxiv.org/abs/quant-ph/9909046v1

Phys. Rev. A 62, 12302 (2000)

Physics

Quantum Physics

9 pages, 1 figure

Scientific paper

10.1103/PhysRevA.62.012302

We consider an N -> M quantum cloning transformation acting on pure two-level states lying on the equator of the Bloch sphere. An upper bound for its fidelity is presented, by establishing a connection between optimal phase covariant cloning and phase estimation. We give the explicit form of a cloning transformation that achieves the bound for the case N=1, M=2, and find a link between this case and optimal eavesdropping in the quantum cryptographic scheme BB84.

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