Device and method for quantum nondemolition measurements using parametric oscillation
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Date
1990-07-31
Authors
Harry J. Kimble
Silvania E. Pereira
Daniel F. Walls
Journal Title
Journal ISSN
Volume Title
Publisher
United States Patent and Trademark Office
Abstract
Quantum nondemolition measurements are made by back-action evasion obtained by a combination of a parametric oscillation and a conversion of polarizations. A polarization converter (14, 16, 17), such as a Faraday rotator, converts at substantially a single frequency between at least a portion of a signal polarization state and a detector polarization state. A parametric amplifier (11) having a gain G is coupled to the polarization converter (14, 16, 17).