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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Generation of nonclassical light and quantum nondemolition measurement by optical fibers with a spatially periodic energy exchange between two modes

A. P. Alodjants, G.A. Jeiranyan, Sergei M Arakelyan

Published Aug 10, 1994• 0 citations
Publisher

Abstract

The generation of nonclassical states of light in optical fibers with a spatial beating of the energy for traveling modes is considered. The effects of quantum squeezing and correlation of photons for two types of optical fibers, i.e. for tunnelly-coupled (dual-core) and for spatially nonhomogeneous fibers, are studied. It is shown that in the field of ordinary CW He-Ne laser at intensity of 100 W/cm2 the suppression of quantum (vacuum) fluctuations of one of the field quadrature components may obtain of a value about ten percent. The possibilities of experimental realization both of suggested scheme for the squeezed states generation and of carrying out of quantum non-demolition measurement are discussed.

DOI
10.1117/12.183154

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Evolution of the vacuum fluctuations in the two-wave mixing of the optical fields propagating in a birefringent fiber is studied. The two-wave mixing in the birefringent fiber was suggested as a possible scheme for the entangled-state generation. Our treatment in studying the entangled-state generation uses depleted pump approximation and enables one to trace the influence of the input conditions of classical optical fields on the evolution of vacuum squeezing. We report the periodical modulation of the vacuum squeezing when the input relative phase of coherent waves varies. The measure of nonclassical correlations imposed on the generated light is calculated.
The analysis of formation of chaotic quantum states for two (or four) orthogonally polarized modes in a tunnelly-coupled optical fiber (TCOF) has been carried out. A special attention is devoted both to the structure of arising polarization instabilities and to the possibility to control of such a quantum state by procedure of quantum nondemolition measurements. New effect of polarization switching is obtained. A new method of generating correlated fluctuations in optical field, based on Raman-Nath diffraction by a fine grating, is discussed. A nonclassical effect is predicted: a suppression of quantum fluctuations below the level of full coherence in the sum of difference photon numbers for the transmitted and scattered waves. The physics of this phenomenon involves a correlation of quantum fluctuations in the intensities of two modes that are coupled nonlinearly. This correlation is most effective in the limit of parametric interaction between the waves in the medium.
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The analysis of formation of chaotic quantum states for two (or four) orthogonally polarized modes in a tunnelly-coupled optical fiber has been carried out. A special attention is devoted both to the structure of arising polarization instabilities and to the possibility to control of such a quantum state by procedure of quantum nondemolition measurements. New effect of polarization switching is obtained and we discuss the problem of both coding of information and construction of quantum logical elements for quantum computing. The optical schemes to realize the quantum AND (NOT-AND), OR (NOT-OR) and controlled-NOT gates with quantum nondemolition filtering of the signal are proposed.