Capacities of linear quantum optical systems

TY - JOUR

T1 - Capacities of linear quantum optical systems

AU - Lupo, Cosmo

AU - Giovannetti, Vittorio

AU - Pirandola, Stefano

AU - Mancini, Stefano

AU - Lloyd, Seth

PY - 2012/6/19

Y1 - 2012/6/19

N2 - A wide variety of communication channels employ the quantized electromagnetic field to convey information. Their communication capacity crucially depends on losses associated to spatial characteristics of the channel such as diffraction and antenna design. Here we focus on the communication via a finite pupil, showing that diffraction is formally described as a memory channel. By exploiting this equivalence we then compute the communication capacity of an optical refocusing system, modeled as a converging lens. Even though loss of information originates from the finite pupil of the lens, we show that the presence of the refocusing system can substantially enhance the communication capacity. We mainly concentrate on communication of classical information, the extension to quantum information being straightforward.

AB - A wide variety of communication channels employ the quantized electromagnetic field to convey information. Their communication capacity crucially depends on losses associated to spatial characteristics of the channel such as diffraction and antenna design. Here we focus on the communication via a finite pupil, showing that diffraction is formally described as a memory channel. By exploiting this equivalence we then compute the communication capacity of an optical refocusing system, modeled as a converging lens. Even though loss of information originates from the finite pupil of the lens, we show that the presence of the refocusing system can substantially enhance the communication capacity. We mainly concentrate on communication of classical information, the extension to quantum information being straightforward.

UR - http://www.scopus.com/inward/record.url?scp=84862673589&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.85.062314

DO - 10.1103/PhysRevA.85.062314

M3 - Article

SN - 1050-2947

VL - 85

SP - -

JO - Physical Review A

JF - Physical Review A

IS - 6

M1 - 062314

ER -