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Optics and Photonics News

Squeezed States: A CLOSER LOOK AT THE AMPLITUDE AND PHASE OF LIGHT

Y. Yamamoto, Wayne H. Richardson

Published May 1, 1995• 1 citation
Publisher

Abstract

Generation and detection of non-classical states of light can now be routinely performed using various techniques. The simplest method: direct generation from a semiconductor laser, has recently attracted considerable attention because of potential applications and the underlying physics.
DOI
10.1364/opn.6.5.000024

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Many quantum states of light and matter, such as coherent states, squeezed states, minimum-uncertainty states, intelligent states, quasi-intelligent states, and symmetric states, have long been of academic interest.1 However, because of the success in realizing and using light squeezing in feasibility experiments, attention is now turning to the realization of more practical light sources. In this paper we adopt a new constructive procedure to look for new states of matter that may eventually permit the generation of squeezed light from new types of advanced semiconductor light sources.
As a direct result of the quantum nature of electromagnetic radiation, all forms of light exhibit inherent and unavoidable random fluctuations. Because these fluctuations reveal information about the nature of light and the underlying processes that generate it, they have received considerable attention since the time of Einstein. But they are also a source of noise that limits the accuracy with which information can be transmitted by a beam of light. Although experiments often still struggle with instrumental noise, some are quickly approaching the measurement limits set by the quantum-statistical nature of light. With the help of new techniques to “squeeze” the uncertainty of light, researchers can now conduct experiments with greater precision than possible with laser light. The generation of various forms of squeezed light in recent years has raised hopes for its application to such diverse areas as gravity-wave detection based on optical interferometry and reduced-error lightwave communications.