Classical communication in the presence of quantum Gaussian noise (Invited Paper)
Jeffrey H. Shapiro, Brent J. Yen, Saikat Guha, Baris I. Erkmen · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2005
The classical information capacity of channels that are subject to quantum Gaussian noise is studied. Recent work has established the capacity of the pure-loss channel, as well as bounds on and a conjecture for the capacity of the lossy channel with isotropic-Gaussian excess noise. This work is applied to the pure-loss free-space channel that uses multiple Hermite-Gaussian (HG) or Laguerre-Gaussian (LG) spatial modes to communicate between soft-aperture transmit and receive pupils, and to the lossy channel with anisotropic (colored) Gaussian noise.