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

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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).

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