Optimal Broadcasting of Mixed States

Details Optimal Broadcasting of Mixed States Optimal Broadcasting of Mixed States

2006-09-23

arxiv.org/abs/quant-ph/0609182v4

Phys. Rev. A 76, 022323 (2007)

Physics

Quantum Physics

10 pages, published version

Scientific paper

10.1103/PhysRevA.76.022323

The N to M (M>N) universal quantum broadcasting of mixed states are proposed for qubits system. The broadcasting of mixed states is universal and optimal in the sense that the shrinking factor is independent of input state and achieves the upper bound. The quantum broadcasting of mixed qubits is a generalization of the universal quantum cloning machine for identical pure input states. A new pure state decompositions of the identical mixed qubits are obtained.

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