Progress Report for University of California. Contract N00014-88-K-0042
Abstract
Work continued on the application of squeezed light to laser stabilization. Emphasis shifted from stabilizing intensity to stabilizing frequency (or phase) to a mode of an optical cavity. The effects of internal amplitude squeezing on a diode laser can reduce the phase fluctuations because of the coupling between amplitude and phase fluctuations in a diode laser. Chained Bell inequalities are used to test the objectivity of quantum mechanics. Chaining the standard (and tested) Clauser-Horne Shimony-Holt Bell inequality can lead to inequalities that display stronger violations by quantum mechanics. They quantified the meaning of 'stronger violations' by giving the strength of the violation in units of noise in a model experiment where the dominant noise is statistical. The channel capacity of a wideband communications channel which has a constraint on its mean power P. is investigated. Ultrasqueezed light is produced by multi-frequency pumping of three-wave and four-wave interactions. For both the three-wave and four-wave cases she has quantified the ultimate noise reduction that can be achieved by use of an optimal detection scheme, and for a fixed pump power one can achieve a greater noise reduction by dividing the power among several pump frequencies, thus producing ultrasqueezed light. A genuinely wideband theory for photodetectors is developed that includes spatial attenuation. The approach is to extend the standard perturbative Glauber theory by including a Langevin equation for the attenuation of the field through the detector.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 29, 1988
- Accession Number
- ADA202931
Entities
People
- Carlton M. Caves
Organizations
- University of Southern California