Quantum Communication and Cryptography (original) (raw)

Quantum Science and Technology, 2016

Abstract

Many of the applications covered in this book involve attempts to mitigate disturbances to an optical signal. Such disturbances may come from the propagation medium (dispersion and turbulence), from the optical instruments being used (aberration) or from random noise in the light source or detectors. However, there are disturbances that are inherent to any quantum system, which can not be eliminated or reduced beyond a fundamental limit; these stem from the Heisenberg uncertainty relations and from the inability to distinguish non-orthogonal states.

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