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Nonunity gain quantum nondemolition measurements based on measurement and repreparation

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Abstract

We demonstrate experimentally a nonunity gain quantum nondemolition measurement based on a simple homodyne measurement and recreation strategy. Although the output state is an amplified version of the input state, the device meets standard criteria for QND measurements: the transfer coefficient was measured to 1.78, and the conditional variance was measured to 0.66.

© 2006 Optical Society of America

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