Communication and Measurement with Squeezed States

Abstract

In this chapter I will discuss the advantages, in principle, of using nonclassical states [1] in communication and measurement situations involving classical information transfer. Most of the discussions will be concerned with the quantum states of light, in particular, the quadrature squeezed states and number states. Thus, optical terminology will be freely employed even though the principles are generally applicable to fermions also, and gravitational wave detection by a free mass will also be treated. I shall focus on the general theoretical concepts and principles underlying such applications of nonclassical states without extensive mathematical derivations, and also no review of the physics involving these states which are covered elsewhere in this book. I shall mostly avoid precise mathematical definitions and formulations, although the treatment is as precise as most standard treatments in theoretical physics or engineering science.KeywordsMutual InformationCoherent StatePhoton NumberQuantum MeasurementQuantum CommunicationThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.