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ground-state cooling based on a three-cavity optomechanical system in the unresolved-sideband regime

Chinese Physics B 2021年第2期30卷 298-303页

作者： Jing Wang College of Physics Tonghua Normal UniversityTonghua 134000China

In the unresolved sideband regime,we propose a scheme for cooling mechanical resonator close to its ground state in a three-cavity optomechanical system,where the auxiliary cavities are indirectly connected with the mechanical resonator through standard optomechanical *** standard optomechanical subsystem is driven by a strong pump laser *** the help of the auxiliary cavities,the heating process is suppressed and the cooling process of the mechanical resonator is *** importantly,the average phonon number is much less than 1 in a larger *** means that the mechanical resonator can be cooled down to its ground *** these interesting features will significantly promote the physical realization of quantum effects in multi-cavity optomechanical systems.

关键词： ground-state cooling three-cavity optomechanical system unresolved sideband regime

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Magnon squeezing enhanced ground-state cooling in cavity magnomechanics

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Fundamental Research 2023年第1期3卷 3-7页

作者： M.Asjad Jie Li Shi-Yao Zhu J.Q.You Department of Applied Mathematics and Sciences Khalifa UniversityAbu Dhabi 127788United Arab Emirates Interdisciplinary Center of Quantum Information State Key Laboratory of Modern Optical Instrumentationand Zhejiang Province Key Laboratory of Quantum Technology and DeviceDepartment of PhysicsZhejiang UniversityHangzhou 310027China

Cavity magnomechanics has recently become a new platform for studying macroscopic quantum *** magnetostriction induced vibration mode of a large-size ferromagnet or ferrimagnet reaching its ground state represents a genuine macroscopic quantum *** we study the ground-state cooling of the mechanical vibration mode in a cavity magnomechanical system,and focus on the role of magnon squeezing in improving the cooling *** magnon squeezing is obtained by exploiting the magnon self-Kerr *** find that the magnon squeezing can significantly and even completely suppress the magnomechanical Stokes *** thus becomes particularly useful in realizing ground-state cooling in the unresolved-sideband regime,where the conventional sideband cooling protocols become *** also find that the coupling to the microwave cavity plays only an adverse effect in mechanical *** makes essentially the two-mode magnomechanical system(without involving the microwave cavity)a preferred system for cooling the mechanical motion,in which the magnon mode is established by a uniform bias magnetic field and a microwave drive field.

关键词： Cavity magnomechanics ground-state cooling Magnetostriction Optomechanics Dispersive coupling

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Suppression of Stokes heating processes and improved optomechanical cooling with frequency modulation

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Communications in Theoretical Physics 2022年第4期74卷 42-51页

作者： Yang Bao Qinghong Liao Qingmin Zhao Jing Wu Department of Electronic Information Engineering Nanchang UniversityNanchang 330031China state Key Laboratory of Low-Dimensional Quantum Physics Department of PhysicsFrontier Science Center for Quantum InformationTsinghua UniversityBeijing 100084China

ground-state cooling of mesoscopic mechanical objects is still a major challenge in the unresolved-sideband *** present a frequency modulation(FM)scheme to achieve cooling of the mechanical resonator to its ground-state in a double-cavity optomechanical system containing a mechanical *** mean phonon number is determined by numerically solving a set of differential equations derived from the quantum master *** to efficient suppression of Stokes heating processes in the presence of FM,the ground-state cooling,indicated by numerical calculations,is significantly achievable,regardless of whether in the resolved-sideband regime or the unresolved-sideband ***,by choosing parameters reasonably,the improvement of the quantum cooling limit is found to be capable of being positively correlated with the modulation *** method provides new insight into quantum manipulation and creates more possibilities for applications of quantum devices.

关键词： ground-state cooling Stokes heating processes frequency modulation unresolved sideband

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