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IEEE Transactions on Information Theory

Comment on "On far-field quantum states in optical communication

Carl W. Helstrom

Published Nov 1, 1980• 0 citations
Publisher

Abstract

The nature of the conversion of a pure nonclassical transmitted quantum state into a mixed classical state at a remote receiver is discussed under assmnptions appropriate to a free-space optical communication system, with particular reference to a correspondence^{1}containing misconceptions about a paper of the author's [1].
DOI
10.1109/tit.1980.1056258

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Reply to Comments on 'On Far-Field Quantum States in Optical Communication'

Horace P. Yuen

IEEE Transactions on Information Theory•Nov 1, 1980•0 citations
The relation between the density operators of the aperture fields of a single-mode optical transmitter and a single-mode receiver is simply expressed in terms of their quasiprobability distributions. This formulation indicates that when the receiver is so far away that it picks up only a small fraction of the transmitted energy, the state induced in its aperture field by a nonclassical transmitted state differs only slightly from what it would be were a certain equivalent classical state transmitted instead. The implications for remote communications are discussed.