Research has established capacity theorems for point-to-point bosonic channels with additive thermal noise, under the presumption of a conjecture on the minimum output von Neumann entropy. In the first part of this thesis, we evaluate the optimum capacity for free-space line-of-sight optical communication using Gaussian-attenuation apertures. Optimal power allocation across all the spatio-temporal modes is studied, in both the far-field and near-field propagation regimes. We establish the gap between ultimate ...
High-sensitivity photodetection systems have long been limited by noises of quantum-mechanical origin. Nevertheless, analyses and designs of optical communication systems have seldom employed fully quantum treatments. As a result, these works do not establish the ultimate limits on optical communication performance. This program established an inner bound on the capacity region for the Bosonic broadcast channel, and showed that this inner bound is in fact the capacity region if a ...
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