Squeezing-enhanced measurement sensitivity in a cavity optomechanical system

Abstract

We determine the theoretical limits to squeezing-enhanced measurement sensitivity of mechanical motion in a cavity optomechanical system. The motion of a mechanical resonator is transduced onto quadrature fluctuations of a cavity optical field and a measurement is performed on the optical field exiting the cavity. We compare measurement sensitivities obtained with coherent probing and quantum-enhanced probing of the mechanical motion, i.e. the coherent probe field carries vacuum states and quadrature squeezed vacuum states at sideband frequencies, respectively. We find that quantum-enhanced probing provides little to no improvement in motion sensing for resonators in the unresolved sideband regime but may significantly increase measurement sensitivities for resonators in the resolved sideband regime.

References in corpus (8)

• Sideband Cooling Micromechanical Motion to the Quantum Ground State
• Strong dispersive coupling of a high finesse cavity to a micromechanical membrane
• Cavity Opto-Mechanics with a Bose-Einstein Condensate
• Nanomechanical motion measured with precision beyond the standard quantum limit
• Observation of Radiation Pressure Shot Noise on a Macroscopic Object
• A Quantum-Enhanced Prototype Gravitational-Wave Detector
• High-sensitivity optical monitoring of a micro-mechanical resonator with a quantum-limited optomechanical sensor
• High-sensitivity monitoring of micromechanical vibration using optical whispering gallery mode resonators