Phys. Rev. Lett. 95, 060503 (2005) [4 pages]

Superbroadcasting of Mixed States

Abstract

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Giacomo Mauro D’Ariano^*, Chiara Macchiavello^†, and Paolo Perinotti^‡
INFM, unità di Pavia and Dipartimento di Fisica “A. Volta,” QUIT Group, via Bassi 6, I-27100 Pavia, Italy

Received 28 February 2005; published 5 August 2005

We derive the optimal universal broadcasting for mixed states of qubits. We show that the no-broadcasting 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.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.95.060503

DOI:

10.1103/PhysRevLett.95.060503

PACS:

03.67.Hk, 03.65.−w

^*Electronic address: dariano@unipv.it

^†Electronic address: chiara@unipv.it

^‡Electronic address: perinotti@fisicavolta.unipv.it

^§URL: http://www.qubit.it

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Phys. Rev. Lett. 95, 060503 (2005) [4 pages]

Superbroadcasting of Mixed States