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High-sensitivity optical monitoring of a micromechanical resonator with a quantum-limited optomechanical sensor.

, , , , , , , , , and . Physical review letters, 97 (13): 133601+ (Sep 29, 2006)

Abstract

We experimentally demonstrate the high-sensitivity optical monitoring of a micromechanical resonator and its cooling by active control. Coating a low-loss mirror upon the resonator, we have built an optomechanical sensor based on a very high-finesse cavity (30 000). We have measured the thermal noise of the resonator with a quantum-limited sensitivity at the 10(-19) m/sqrtHz level, and cooled the resonator down to 5 K by a cold-damping technique. Applications of our setup range from quantum optics experiments to the experimental demonstration of the quantum ground state of a macroscopic mechanical resonator.

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