Back-action cancellation in interferometers by quantum locking

Details Back-action cancellation in interferometers by quantum locking Back-action cancellation in interferometers by quantum locking

2003-01-20

arxiv.org/abs/gr-qc/0301068v2

Europhys.Lett.63:226-232,2003

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, 3 figures, RevTeX

Scientific paper

10.1209/epl/i2003-00527-x

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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