Superbroadcasting of mixed states
Quantum Physics
2007-05-23 v1
Abstract
We derive the optimal universal broadcasting for mixed states of qubits. We show that the nobroadcasting theorem cannot be generalized to more than a single input copy. Moreover, for four or more input copies it is even possible to purify the input states while broadcasting. We name such purifying broadcasting superbroadcasting.
Cite
@article{arxiv.quant-ph/0506251,
title = {Superbroadcasting of mixed states},
author = {Giacomo Mauro D'Ariano and Chiara Macchiavello and Paolo Perinotti},
journal= {arXiv preprint arXiv:quant-ph/0506251},
year = {2007}
}
Comments
4 pages, 4 figures, to appear on Phys. Rev. Lett