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Frontiers in Optics

Applications of Slow Light for Telecommunications and Quantum Information

Robert W. Boyd

Published Jan 1, 2005• 0 citations
Publisher

Abstract

Procedures developed in recent years allow the group velocity of propagation of light through material systems to be lowered in a significant and controllable manner. This ability to control the velocity of light leads to a variety of important applications in fields such as telecommunications and quantum information. Some of the advances in methods that lead to this slow-down and progress toward developing applications are reviewed in the present work.

DOI
10.1364/ls.2005.lwb5

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Procedures developed in recent years allow the group velocity of propagation of light through material systems to be lowered in a significant and controllable manner. This ability to control the velocity of light leads to a variety of important applications in fields such as telecommunications and quantum information. Some of the advances in methods that lead to this slow-down and progress toward developing applications are reviewed in the present work.
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We review progress in the development of methods for controlling the group velocity of light. These methods allow one to create situations in which the group velocity of light is much smaller than the velocity of light in vacuum c, in which the group velocity is greater than c, or in which the group velocity is negative. We present a survey of methods for establishing extreme values of the group velocity, concentrating especially on methods that can work in room temperature solids. We also describe some of the applications of slow and fast light that are currently under development.
We review progress in the development of methods for controlling the group velocity of light. These methods allow one to create situations in which the group velocity of light is much smaller than the velocity of light in vacuum c, in which the group velocity is greater than c, or in which the group velocity is negative. We present a survey of methods for establishing extreme values of the group velocity, concentrating especially on methods that can work in room temperature solids. We also describe some of the applications of slow and fast light that are currently under development.
An overview of recent research aimed at controlling the propagation velocity of light pulses through material systems is presented. Most of the research involves two basic approaches. One approach is to make use of quantum coherence effects, such as electromagnetically induced transparency or coherent population oscillations, to modify the material response at an atomic level. Another approach is to form artificial material, such as photonic crystals, that possess strong dispersive properties which lead to a large modification to the group velocity. Both of these approaches have been successfully pursued in recent years.
The control of the group velocity of optical signals has been widely demonstrated using various optical phenomena and different media. Slow and fast light is achieved in a controllable manner by modifying the refractive index dispersion through light induced modifications of the material or the structural properties of the medium. The potential for a continuous tuning of the phase or time delay of broadband microwave signals modulating the optical carrier opens previously unexplored horizons. The talk will review the recent advancements and the future directions of slow and fast light research with an emphasis on microwave-photonics applications.