Europhys. Lett.
Volume 70, Number 6, June 2005
Page(s) 719 - 725
Section General
Published online 13 May 2005
Europhys. Lett., 70 (6), pp. 719-725 (2005)
DOI: 10.1209/epl/i2005-10041-3

Information transmission through lossy bosonic memory channels

G. Ruggeri1, 2, G. Soliani1, 2, V. Giovannetti3 and S. Mancini4, 5

1  Dipartimento di Fisica, Università di Lecce - I-73100 Lecce, Italy
2  INFN, Sezione di Lecce - I-73100 Lecce, Italy
3  NEST-INFM & Scuola Normale Superiore - I-56126 Pisa, Italy
4  Dipartimento di Fisica, Università di Camerino - I-62032 Camerino, Italy
5  INFN, Sezione di Perugia - I-06123 Perugia, Italy

received 15 February 2005; accepted in final form 20 April 2005
published online 13 May 2005

We study the information transmission through a quantum channel, defined over a continuous alphabet and losing its energy en route, in the presence of correlated noise among different channel uses. We then show that entangled inputs improve the rate of transmission of such a channel.

03.65.Ud - Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.).
03.67.Hk - Quantum communication.
89.70.+c - Information theory and communication theory.

© EDP Sciences 2005