Reduction and Possible Elimination of Coating Thermal Noise Using a Rigidly Controlled Cavity with a Quantum-Nondemolition Technique

Thermal noise of a mirror is one of the most important issues in high-precision measurements such as gravitational-wave detection or cold damping experiments.It has been pointed out that thermal noise of a mirror with multilayer coatings can be reduced by mechanical separation of the layers.In this Letter, we introduce a way to further reduce thermal noise by locking the mechanically separated mirrors.The reduction is limited by the standard quantum limit of control noise, but it can be overcome with a quantum-nondemolition technique, which finally raises a possibility of complete elimination of coating thermal noise.

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