Universal and phase covariant superbroadcasting for mixed qubit states
Quantum Physics
2007-05-23 v1
Abstract
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.
Keywords
Cite
@article{arxiv.quant-ph/0602125,
title = {Universal and phase covariant superbroadcasting for mixed qubit states},
author = {Francesco Buscemi and Giacomo Mauro D'Ariano and Chiara Macchiavello and Paolo Perinotti},
journal= {arXiv preprint arXiv:quant-ph/0602125},
year = {2007}
}
Comments
19 pages, 8 figures, strictly related to quant-ph/0506251 and quant-ph/0510155