We evaluate the information capacities of a lossy bosonic channel with correlated noise. The model generalizes the one recently discussed by Pilyavets et al (2008 Phys. Rev. A 77 052324), where memory effects come from the interaction with correlated environments. Environmental correlations are quantified by a multimode squeezing parameter, which vanishes in the memoryless limit. We show that a global encoding/decoding scheme, which involves input-entangled states among different channel uses, is always preferable with respect to a local one in the presence of memory. Moreover, in a certain range of the parameters, we provide an analytical expression for the classical capacity of the channel showing that a global encoding/decoding scheme allows it to be attained. All the results can be applied to a broad class of bosonic Gaussian channels.

Capacities of lossy bosonic channel with correlated noise / Lupo, C; V Pilyavets, O; Mancini, S. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - 11:(2009). [10.1088/1367-2630/11/6/063023]

Capacities of lossy bosonic channel with correlated noise

C Lupo
;
2009-01-01

Abstract

We evaluate the information capacities of a lossy bosonic channel with correlated noise. The model generalizes the one recently discussed by Pilyavets et al (2008 Phys. Rev. A 77 052324), where memory effects come from the interaction with correlated environments. Environmental correlations are quantified by a multimode squeezing parameter, which vanishes in the memoryless limit. We show that a global encoding/decoding scheme, which involves input-entangled states among different channel uses, is always preferable with respect to a local one in the presence of memory. Moreover, in a certain range of the parameters, we provide an analytical expression for the classical capacity of the channel showing that a global encoding/decoding scheme allows it to be attained. All the results can be applied to a broad class of bosonic Gaussian channels.
2009
Capacities of lossy bosonic channel with correlated noise / Lupo, C; V Pilyavets, O; Mancini, S. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - 11:(2009). [10.1088/1367-2630/11/6/063023]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/248848
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