Capacities of linear quantum optical systems
Author(s)Lupo, Cosmo; Giovannetti, Vittorio; Pirandola, Stefano; Mancini, Stefano; Lloyd, Seth
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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.
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering
Physical Review A
American Physical Society
Lupo, Cosmo et al. “Capacities of Linear Quantum Optical Systems.” Physical Review A 85.6 (2012): 062314. © 2012 American Physical Society.
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