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ground state cooling of magnomechanical resonator in PT-symmetric cavity magnomechanical system at room temperature

Frontiers of physics 2020年第5期15卷 145-154页

作者： Zhi-xin Yang Liang Wang Yu-Mu Liu Dong-Yang Wang Cheng-Hua Bai Shou Zhang Hong-Fu Wang Department of Physics College of ScienceYanbian UniversityYanji 133002China Center for Quantum Sciences and School of Physics Northeast Normal UniversitChangchun 130024China School of Physics Harbin Institute of TechnologyHarbin 150001China

We propose to realize the ground state cooling of magnomechanical resonator in a parity-time(PT).symmetric cavity magnomechanical system composed of a loss ferromagnetic sphere and a gain microwave cavity.In the scheme,the magnomechanical resonator can be cooled close to its ground state via the magnomechanical interaction,and it is found that the cooling effect in PT-symmetric system is much higher than that in non-PT-symmetric system.Resorting to the magnetic force noise spectrum,we investigate the final mean phonon number with experimentally feasible parameters and find surprisingly that the ground state cooling of magnomechanical resonator can be directly achieved at room temperature.Furthermore,we also illustrate that the ground state cooling can be flexibly controlled via the external magnetic field.

关键词： ground state cooling magnomechanical resonator PT-symmetry

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Normal mode splitting and ground state cooling in a Fabry-Perot optical cavity and transmission line resonator

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Chinese Physics B 2011年第12期20卷 249-258页

作者：陈华俊米贤武 College of Physics Mechanical and Electrical EngineeringJishou University

Optomechanical dynamics in two systems which are a transmission line resonator and Fabrya-Perot optical cavity via radiation-pressure are investigated by linearized quantum Langevin equation. We work in the resolved sideband regime where the oscillator resonance frequency exceeds the cavity linewidth. Normal mode splittings of the mechanical resonator as a pure result of the coupling interaction in the two optomechanical systems is studied, and we make a comparison of normal mode splitting of mechanical resonator between the two systems. In the optical cavity, the normal mode splitting of the movable mirror approaches the latest experiment very well. In addition, an approximation scheme is introduced to demonstrate the ground state cooling, and we make a comparison of cooling between the two systems dominated by two key factors, which are the initial bath temperature and the mechanical quality factor. Since both the normal mode splitting and cooling require working in the resolved sideband regime, whether the normal mode splitting influences the cooling of the mirror is considered. Considering the size of the mechanical resonator and precooling the system, the mechanical resonator in the transmission line resonator system is easier to achieve the ground state cooling than in optical cavity.

关键词： optomechanical system normal mode splitting ground state cooling

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Review of cavity optomechanical cooling

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Chinese Physics B 2013年第11期22卷 101-113页

作者：刘永椿胡毓文黄智维肖云峰 state Key Laboratory for Mesoscopic Physics and School of Physics Peking University Optical Nanostructures Laboratory Columbia University New York

Quantum manipulation of macroscopic mechanical systems is of great interest in both fundamental physics and ap- plications ranging from high-precision metrology to quantum information processing. For these purposes, a crucial step is to cool the mechanical system to its quantum ground state. In this review, we focus on the cavity optomechanical cooling, which exploits the cavity enhanced interaction between optical field and mechanical motion to reduce the thermal noise. Recent remarkable theoretical and experimental efforts in this field have taken a major step forward in preparing the mo- tional quantum ground state of mesoscopic mechanical systems. This review first describes the quantum theory of cavity optomechanical cooling, including quantum noise approach and covariance approach; then, the up-to-date experimental progresses are introduced. Finally, new cooling approaches are discussed along the directions of cooling in the strong coupling regime and cooling beyond the resolved sideband limit.

关键词： cavity optomechanics optomechanical cooling ground state cooling mechanical resonator

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