Universal and phase covariant superbroadcasting for mixed qubit states

Details Universal and phase covariant superbroadcasting for mixed qubit states Universal and phase covariant superbroadcasting for mixed qubit states

2006-02-15

arxiv.org/abs/quant-ph/0602125v1

Phys. Rev. A 74, 042309 (2006)

Physics

Quantum Physics

19 pages, 8 figures, strictly related to quant-ph/0506251 and quant-ph/0510155

Scientific paper

10.1103/PhysRevA.74.042309

We describe a general framework to study covariant symmetric broadcasting
maps for mixed qubit states. We explicitly derive the optimal N to M
superbroadcasting maps, achieving optimal purification of the single-site
output copy, in both the universal and the phase covariant cases. We also study
the bipartite entanglement properties of the superbroadcast states.

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