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IEEE Transactions on Information Theory

On far-field quantum states in optical communication (Corresp.)

Horace P. Yuen

Published May 1, 1980• 2 citations
Publisher

Abstract

The recent issues surrounding the feasibility of greatly improved far-field optical communication via the use of nonclassical quantum states are analyzed.
DOI
10.1109/tit.1980.1056182

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

Carl W. Helstrom

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].

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

Horace P. Yuen

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Nonclassical states in optical communication to a remote receiver (Corresp.)

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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.

IEEE Transactions on Information Theory•May 1, 1980•12 citations

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Optical Field Squeezed States and Its Application in the Quantum Communication

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Journal of Wuhan University of Technology-Mater Sci Ed•Jan 1, 2008•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.
An enhanced or improved far-field-diffracted optical dipole trap with a red or blue detuning for cold atoms or molecules on an optical chip is proposed, and our trap scheme is formed by an optical system composed of a binary phase plate and a circular aperture illuminated by a plane light wave. The relative radial and axial intensity distributions of the far-field optical trap and its optical potentials for 87Rb atoms are calculated, and the dependences of the relative intensity of the far-field optical trap and its well depth on the modulated phase φ of the phase plate are studied. Also, the feasibility of our enhanced far-field optical trap is analyzed, and some potential applications of our optical trap are briefly discussed. Our research shows that some geometric and optical parameters of the far-field optical trap can be greatly improved, and the evolution of the far-field optical trap from a red-detuned optical trap to a blue-detuned one can be realized by using our proposed binary phase plate. Particularly, with the change of the modulated phase φ from 0 to −π, the maximum intensity (i.e., the well depth) of the far-field optical trap and its trapping volume will be increased by about four and eight times, respectively. While the modulated phase φ of the phase plate is changed from 0 to π, a red-detuned optical trap will be evolved as a blue-detuned one, and the corresponding trapping intensity and volume will be enhanced by about 4 times. So such an enhanced far-field optical trap scheme has some important applications in the fields of laser cooling and trapping; atomic, molecular, and optical physics; integrated atom or molecule optics; quantum information science; and so on.