Beating quantum limits in interferometers with quantum locking of mirrors

Details Beating quantum limits in interferometers with quantum locking of mirrors Beating quantum limits in interferometers with quantum locking of mirrors

2003-11-25

arxiv.org/abs/quant-ph/0311167v1

J.Opt.B Quant.Semiclass.Opt. 6 (2004) S684

Physics

Quantum Physics

Scientific paper

10.1088/1464-4266/6/8/009

The sensitivity in interferometric measurements such as gravitational-wave detectors is ultimately limited by quantum noise of light. We discuss the use of feedback mechanisms to reduce the quantum effects of radiation pressure. Recent experiments have shown that it is possible to reduce the thermal motion of a mirror by cold damping. The mirror motion is measured with an optomechanical sensor based on a high-finesse cavity, and reduced by a feedback loop. We show that this technique can be extended to lock the mirror at the quantum level. In gravitational-waves interferometers with Fabry-Perot cavities in each arms, it is even possible to use a single feedback mechanism to lock one cavity mirror on the other. This quantum locking greatly improves the sensitivity of the interferometric measurement. It is furthermore insensitive to imperfections such as losses in the interferometer.

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