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Phys. Rev. A 65, 050301 (2002) [4 pages]

Entanglement-enhanced information transmission over a quantum channel with correlated noise

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Chiara Macchiavello1 and G. Massimo Palma2
1Istituto Nazionale per la Fisica della Materia (INFM) and Dipartimento di Fisica “A. Volta,” Via Bassi 6, I-27100 Pavia, Italy
2NEST – Istituto Nazionale per la Fisica della Materia (INFM) and Dipartimento di Scienze Fisiche ed Astronomiche, Via Archirafi 36, I-90123 Palermo, Italy

Rapid Communication Received 10 July 2001; published 17 April 2002

We show that entanglement is a useful resource to enhance the mutual information of the depolarizing channel when the noise on consecutive uses of the channel has some partial correlations. We obtain a threshold in the degree of memory above which a higher amount of classical information is transmitted with entangled signals.


©2002 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.65.050301
DOI: 10.1103/PhysRevA.65.050301
PACS: 03.67.Hk, 05.40.Ca

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