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Detection of DC electric forces with zeptonewton sensitivity by single-ion phonon laser

Science China(Physics,Mechanics & Astronomy) 2022年第11期65卷 107-114页

作者： Ya-Qi Wei Ying-Zheng Wang Zhi-Chao Liu Tai-Hao Cui Liang Chen Ji Li Shuang-Qin Dai Fei Zhou Mang Feng State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsInnovation Academy of Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan430071China University of the Chinese Academy of Sciences Beijing100049China Laboratory of Quantum Science and Engineering South China University of TechnologyGuangzhou510641China Research Center for Quantum Precision Measurement Guangzhou Institute of Industry TechnologyGuangzhou511458China School of Physics Zhengzhou UniversityZhengzhou450001China Department of Physics Zhejiang Normal UniversityJinhua321004China

Detecting extremely small forces helps exploring new physics quantitatively.Here we demonstrate that the phonon laser made of a single trapped ^(40)Ca^(+) ion behaves as an exquisite sensor for small force measurement.We report our successful detection of small electric forces regarding the DC trapping potential with sensitivity of(2.41±0.49)zN/√Hz,with the ion only under Doppler cooling,based on the injection-locking of the oscillation phase of the phonon laser in addition to the classical squeezing applied to suppress the measurement uncertainty.We anticipate that such a single-ion sensor would reach a much better force detection sensitivity in the future once the trapping system is further improved and the fluorescence collection efficiency is further enhanced.

关键词： single-ion sensor phonon laser super-sensitive detection injection locking classical squeezing

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Numerical studies on the boundary entanglement in an optomechanical phonon laser system

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Communications in Theoretical Physics 2020年第11期72卷 37-42页

作者： Qing-Xia Meng Zhi-Jiao Deng Shi-Wei Cui Department of Physics College of Liberal Arts and SciencesNational University of Defense TechnologyChangsha 410073China Northwest Institute of Nuclear Technology Xi’an 710024ShaanxiChina Interdisciplinary Center for Quantum Information National University of Defense TechnologyChangsha 410073China

In our previous work(Meng et al 2020 Phys.Rev.A 101023838),we discover the phenomenon that the quantum entanglement on the driving threshold line remains a constant in a three-mode optomechanical phonon laser system.In this paper,to find the conditions under which the constant boundary entanglement shows up,we explicitly study how this boundary entanglement depends on various parameters through numerical integrations.The results show that the necessary and sufficient condition is a resonant frequency match between the optical frequency difference and the mechanical vibrational frequency,and this constant value is proportional to the multiplication of the square of the optomechanical coupling strength and the resonant driving threshold power.

关键词： boundary entanglement optomechanics phonon laser

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Magnonic frequency combs based on the resonantly enhanced magnetostrictive effect

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Fundamental Research 2023年第1期3卷 8-14页

作者： Hao Xiong School of Physics Huazhong University of Science and TechnologyWuhan 430074China

A magnonic counterpart to optical frequency combs is vital for high-precision magnonic frequency metrology and spectroscopy.Here,we present an efficient mechanism for the generation of robust magnonic frequency combs in a yttrium iron garnet(YIG)sphere via magnetostrictive effects.We show that magnonic and vibrational dynamics in the ferrimagnetic sphere can be substantively modified in the presence of magnetostrictive effects,which results in degenerate and non-degenerate magnonic four-wave mixing and frequency conversion.Particularly,resonantly enhanced magnetostrictive effects can induce phonon laser action above a threshold,which leads to significant magnonic nonlinearity and enables a potentially practical scheme for the generation of robust magnonic frequency combs.Numerical calculations of both magnonic and phononic dynamics show excellent agreement with this theory.These results deepen our understanding of magnetostrictive interaction,open a novel and efficient pathway to realize magnonic frequency conversion and mixing in a magnonic device,and provide a sensitive tool for precision measurement.

关键词： Magnonic frequency combs Magnetostrictive effects Ferrimagnetic sphere phonon laser Cavity magnomechanics

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