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arXiv · 2110.01146

Phonon-laser ultrasensitive force sensor

Zhichao Liu·Yaqi Wei·Liang Chen·Ji Li·Shuangqing Dai·Fei Zhou·Mang Feng
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Abstract

Developing nano-mechanical oscillators for ultrasensitive force detection is of great importance in exploring science. We report our achievement of ultrasensitive detection of the external force regarding the radio-frequency electric field by a nano-sensor made of a single trapped $^{40}$Ca$^{+}$ ion under injection-locking, where squeezing is additionally applied to detection of the smallest force in the ion trap. The employed ion is confined stably in a surface electrode trap and works as a phonon laser that is very sensitive to the external disturbance. The injection-locking drove the ion's oscillation with phase synchronization, yielding the force detection with sensitivity of 347 $\pm$ 50 yN/$\sqrt{Hz}$. Further with 3 dB squeezing applied on the oscillation phase variance, we achieved a successful detection of the smallest force to be 86.5 $\pm$ 70.1 yN.

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Zhichao Liu, Yaqi Wei, Liang Chen, Ji Li, Shuangqing Dai, Fei Zhou, Mang Feng. 2021-10-04. Phonon-laser ultrasensitive force sensor. https://arxiv.org/abs/2110.01146

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