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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 phenomena.The magnetostriction induced vibration mode of a large-size ferromagnet or ferrimagnet reaching its ground state represents a genuine macroscopic quantum state.Here 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 efficiency.The magnon squeezing is obtained by exploiting the magnon self-Kerr nonlinearity.We find that the magnon squeezing can significantly and even completely suppress the magnomechanical Stokes scattering.It thus becomes particularly useful in realizing ground-state cooling in the unresolved-sideband regime,where the conventional sideband cooling protocols become inefficient.We also find that the coupling to the microwave cavity plays only an adverse effect in mechanical cooling.This 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

10-Hertz squeezed light source generation on the cesium D_(2)line using single photon modulation

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Frontiers of physics 2023年第3期18卷 167-174页

作者： Guan-Hua Zuo Yu-Chi Zhang Gang Li Peng-Fei Zhang Peng-Fei Yang Yan-Qiang Guo shi-yao zhu Tian-Cai Zhang State Key Laboratory of Quantum Optics and Quantum Optics Devices Collaborative Innovation Center of Extreme OpticsInstitute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China College of Physics and Electronic Engineering Shanxi UniversityTaiyuan 030006China Department of Physics Zhejiang UniversityHangzhou 310027China Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceCollege of Physics and OptoelectronicsTaiyuan University of TechnologyTaiyuan 030024China

Generation of squeezed light source is a promising technique to overcome the standard quantum limit in precision measurement.Here,we demonstrate an experimental generation of quadrature squeezing resonating on the cesium D_(2)line down to 10 Hz for the first time.The maximum squeezing in audio frequency band is 5.57 dB.Moreover,we have presented a singlephoton modulation locking to control the squeezing angle,while effectively suppressing the influence of laser noise on low-frequency squeezing.The whole system operates steadily for hours.The generated low-frequency squeezed light source can be applied in quantum metrology,light–matter interaction investigation and quantum memory in the audio frequency band and even below.

关键词： squeezed state optical parametric amplifier low-frequency squeezing

Measuring Zak phase in room-temperature atoms

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Light(Science & Applications) 2022年第10期11卷 2530-2539页

作者： Ruosong Mao Xingqi Xu Jiefei Wang Chenran Xu Gewei Qian Han Cai shi-yao zhu Da-Wei Wang Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentationand Zhejiang Province Key Laboratory of Quantum Technology and DeviceSchool of PhysicsZhejiang UniversityHangzhou 310027China College of Optical Science and Engineering Zhejiang UniversityHangzhou 310027China Hefei National Laboratory Hefei 230088China CAS Center of Excellence in Topological Quantum Computation 100190 BeijingChina

Cold atoms provide a flexible platform for synthesizing and characterizing topological matter,where geometric phases play a central role.However,cold atoms are intrinsically prone to thermal noise,which can overwhelm the topological response and hamper promised applications.On the other hand,geometric phases also determine the energy spectra of particles subjected to a static force,based on the polarization relation between Wannier-Stark ladders and geometric Zak phases.By exploiting this relation,we develop a method to extract geometric phases from energy spectra of room-temperature superradiance lattices,which are momentum-space lattices of timed Dicke states.In such momentum-space lattices the thermal motion of atoms,instead of being a source of noise,provides effective forces which lead to spectroscopic signatures of the Zak phases.We measure Zak phases directly from the anti-crossings between Wannier-Stark ladders in the Doppler-broadened absorption spectra of superradiance lattices.Our approach paves the way of measuring topological invariants and developing their applications in room-temperature atoms.

关键词： topological momentum invariants

Suppression and Acceleration Effects of Measurements on A-type Atomic Decay in Anisotropic Photonic Crystals

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量子光学学报 2006年第B8期12卷 69-70页

作者： Yaping Yang Xianshan Huang shi-yao zhu Department of Physics Tongji University Shanghai 200092 China Department of Physics Hong Kong Baptist University Kowloon Tong HongKong

Beam Shaping and Displacement in Single- and Multi-layered Structures Containing Meta-materials and Dielectric Media

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量子光学学报 2006年第B8期12卷 74-74页

作者： Li-gang Wang shi-yao zhu Department of Physics Zhefiang University Hangzhou 310027 China Department of Physics Hong Kong Baptist University Kowloon Tong Hong Kong

Spontaneous Emission Decay of a Two-level Atom in a Structure with Modified Density of Spectrum

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量子光学学报 2006年第B8期12卷 81-81页

作者： Nian-hua Liu shi-yao zhu Department of Physics Nanchang University Nanchang 330047 China Department of Physics Hong Kong Baptist University Kowloon Tong Hong Kong

Non-Markoffian Dynamic Evolution of Spontaneous Emission in Photonic Crystals

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量子光学学报 2006年第B8期12卷 69-69页

作者： shi-yao zhu Nian-Hua Liu Jing-Ping Xu Department of Physics Hong Kong Baptist University Kowloon Tong Hong Kong Department of Physics Nanchang University 235 Nanjing East Road Nanchang 330029 China Department of Physics Tongji University Shanghai 200092 China

Continuous-variable Entanglement in a Correlated Spontaneous Emission Laser

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量子光学学报 2006年第B8期12卷 83-83页

作者： Hua-tang Tan shi-yao zhu M. Suhail Zubairy Department of Physics Hong Kong Baptist University Hong Kong China Department of Physics Huazhong Normal University Wuhan China Institute for Quantum Studies and Department of Physics Texas A＆M University Texas 77843-4242 USA

Insufficient TRPM5 Mediates Lipotoxicity-induced Pancreaticβ-cell Dysfunction

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Current Medical Science 2024年第2期44卷 346-354页

作者： Kai-yuan WANG shi-mei WU Zheng-jian yao Yun-xia zhu Xiao HAN Key Laboratory of Human Functional Genomics of Jiangsu Province Department of Biochemistry and Molecular BiologyNanjing Medical UniversityNanjing 211166China

Objective:While the reduction of transient receptor potential channel subfamily M member 5(TRPM5)has been reported in islet cells from type 2 diabetic(T2D)mouse models,its role in lipotoxicity-induced pancreaticβ-cell dysfunction remains unclear.This study aims to study its role.Methods:Pancreas slices were prepared from mice subjected to a high-fat-diet(HFD)at different time points,and TRPM5 expression in the pancreaticβcells was examined using immunofluorescence staining.Glucose-stimulated insulin secretion(GSIS)defects caused by lipotoxicity were mimicked by saturated fatty acid palmitate(Palm).Primary mouse islets and mouse insulinoma MIN6 cells were treated with Palm,and the TRPM5 expression was detected using qRT-PCR and Western blotting.Palm-induced GSIS defects were measured following siRNA-based Trpm5 knockdown.The detrimental effects of Palm on primary mouse islets were also assessed after overexpressing Trpm5 via an adenovirus-derived Trpm5(Ad-Trpm5).Results:HFD feeding decreased the mRNA levels and protein expression of TRPM5 in mouse pancreatic islets.Palm reduced TRPM5 protein expression in a time-and dose-dependent manner in MIN6 cells.Palm also inhibited TRPM5 expression in primary mouse islets.Knockdown of Trpm5 inhibited insulin secretion upon high glucose stimulation but had little effect on insulin biosynthesis.Overexpression of Trpm5 reversed Palm-induced GSIS defects and the production of functional maturation molecules unique toβcells.Conclusion:Our findings suggest that lipotoxicity inhibits TRPM5 expression in pancreaticβcells both in vivo and in vitro and,in turn,drivesβ-cell dysfunction.

关键词： type 2 diabetes β-cell dysfunction lipotoxicity TRPM5