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Back-action cancellation in interferometers by quantum locking

J. -M. Courty·A. Heidmann·M. Pinard
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Abstract

We show that back-action noise in interferometric measurements such as gravitational-waves detectors can be completely suppressed by a local control of mirrors motion. An optomechanical sensor with an optimized measurement strategy is used to monitor mirror displacements. A feedback loop then eliminates radiation-pressure effects without adding noise. This very efficient technique leads to an increased sensitivity for the interferometric measurement, which becomes only limited by phase noise. Back-action cancellation is furthermore insensitive to losses in the interferometer.

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J. -M. Courty, A. Heidmann, M. Pinard. 2003-05-22. Back-action cancellation in interferometers by quantum locking. https://doi.org/10.1209/epl%2Fi2003-00527-x

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