Parametric squeezing of mechanical resonator in an optomechanical system

Abstract

Abstract: Micromechanical resonator is widely used in accurate measurements, in which frequency modulation and amplitude modulation are two usually used techniques. Generally, the force sensitivity of mechanical resonator is mainly limited by the thermal noise. Therefore, the thermal noise of measurement quadrature can be reduced through squeezing the mechanical resonator to effectively increase the sensitivity of the mechanical resonator. By using a phase lock loop to lock the resonator’s frequency, a specified motion quadrature of mechanical resonator is squeezed through modulating the frequency of the mechanical resonator at twice of its resonant frequency, which is implemented in an optical trap. In order to overcome 3dB limit of the parametric squeezing, a feedback loop is employed to stabilize measurement system. And a squeezing rate of 4.4dB is achieved when the feedback loop is activated.

Key words: quantum optics, parametric squeezing, cavity optomechanical system, micro-nano resonator, feedback control

CLC Number:

0431.2

SHEN Chengyu, MAO Tianhua, GONG Zhicheng, YUAN Quan, FU Hao, CAO Gengyu. Parametric squeezing of mechanical resonator in an optomechanical system[J]. Chinese Journal of Quantum Electronics, 2020, 37(1): 29-33.

References

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