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Phase-controlled quantum optomechanics

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Science China(Physics,Mechanics & Astronomy) 2023年第3期66卷 189-190页

Quantum entanglement,featuring nonclassical correlations between distinct and usually spatially separated systems,is one of the key traits of quantum *** creating and sharing entangled states between different nodes in a quantum network,a variety of novel quantum technologies well beyond the abilities of clas sical devices can be realized,ranging from quantum sensing to quantum information processing or communication.

关键词： quantum spatially separated

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Cavity optomechanics

Fundamental Research 2023年第1期3卷 1-2页

作者： Jie-Qiao Liao chun-hua dong Min Wang Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceDepartment of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China Beijing Academy of Quantum Information Sciences Beijing 100193China

Cavity optomechanics,a fast-developing research frontier related to quantum physics,optics,and nano-science,addresses the radiationpressure couplings between the electromagnetic fields in cavities and the mechanical oscillation of micro-and nano-scale mechanical resonators,and explores the fundamental physical phenomena and effects induced by the optomechanical interactions,as well as the applications of optomechanical effects to modern quantum technologies.

关键词： quantum frontier optics

Breaking the efficiency limitations of dissipative Kerr solitons using nonlinear couplers

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Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 88-94页

作者： Ming Li Xiao-Xiao Xue Yan-Lei Zhang Xin-Biao Xu chun-hua dong Guang-Can Guo Chang-Ling Zou CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Centerfor Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Department of Electronic Engineering Beijing National Research Center for Information Science and TechnologyTsinghua University Beijing 100084China

Dissipative Kerr solitons(DKS) have long been suffering from poor power conversion efficiency when driven by continuous-wave lasers. By deriving the critical coupling condition of a multimode nonlinear optics system in a generalized theoretical framework,two efficiency limitations of the conventional pump method of DKS are revealed: the effective coupling rate is too small and is also power-dependent. A general approach is provided to resolve this challenge by introducing two types of nonlinear couplers to couple the soliton cavity and CW input through nonlinear processes. The collective coupler opens multiple coupling channels and the self-adaptive coupler builds a power-independent effective external coupling rate to the DKS for approaching the generalized critical coupling condition, which promises near-unity power conversion efficiencies. For instance, a conversion efficiency exceeding 90% is predicted for aluminum nitride microrings with a nonlinear coupler utilizing second-harmonic generation. The mechanism applies to various nonlinear processes, including Raman and Brillouin scattering, and thus paves the way for micro-solitons toward practical applications.

关键词： Kerr frequency comb conversion efficiency nonlinear coupler

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Gear-like array of (H_2O)_(12) as building blocks in one-dimensional supramolecular assembly

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Chinese Chemical Letters 2007年第11期18卷 1389-1391页

作者： chun hua Ge Xiang dong Zhang Yong Chao Ma Lei Guan chun Yue Shi Xiao Yan Zhang Ya Nan Guo Qi Tao Liu College of Chemistry Liaoning University Shenyang 110036 China

The preparation and crystal structure of complex Co（Hsae）2·2H2O （1, H2sae = N-salicylidene-2-iminoethanol） are reported. X- ray analysis revealed that every six Co（Hsae）2 forms a cyclic chip and every 12 water forms a novel gear-like cluster. Acting as building blocks, the gear-like water cluster and complex chip are connected in A-B fashion and extend into one-dimensional supramolecular chain. Hydrogen bond is the primary bridging force in the formation of supramolecular framework.

关键词： Co(Ⅱ) complex N-Salicylidene-2-iminoethanol Hydrogen bond Water cluster One-dimensional chain Supramolecular chemistry

Soliton formation and spectral translation into visible on CMOS-compatible 4H-silicon-carbide-oninsulator platform

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Light(Science & Applications) 2022年第12期11卷 3059-3068页

作者： Chengli Wang Jin Li Ailun Yi Zhiwei Fang Liping Zhou Zhe Wang Rui Niu Yang Chen Jiaxiang Zhang Ya Cheng Junqiu Liu chun-hua dong Xin Ou State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences200050 ShanghaiChina The Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences100049 BeijingChina CAS Key Laboratory of Quantum Information University of Science and Technology of China230026 HefeiChina CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China230026 HefeiChina The Extreme Optoelectromechanics Laboratory(XXL) School of Physics and Electronic ScienceEast China Normal University200241 ShanghaiChina State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultraintense Laser Science Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences201800 ShanghaiChina International Quantum Academy 518048 ShenzhenChina Hefei National Laboratory University of Science and Technology of ChinaHefei 230026China

Recent advancements in integrated soliton microcombs open the route to a wide range of chip-based communication,sensing,and metrology *** technology translation from laboratory demonstrations to real-world applications requires the fabrication process of photonics chips to be fully CMOS-compatible,such that the manufacturing can take advantage of the ongoing evolution of semiconductor technology at reduced cost and with high *** nitride has become the leading CMOS platform for integrated soliton devices,however,it is an insulator and lacks intrinsic second-order nonlinearity for electro-optic *** materials have emerged such as AlN,LiNbO_(3),AlGaAs and GaP that exhibit simultaneous second-and third-order ***,we show that silicon carbide(SiC)--already commercially deployed in nearly ubiquitous electrical power devices such as RF electronics,MOSFET,and MEMS due to its wide bandgap properties,excellent mechanical properties,piezoelectricity and chemical inertia--is a new competitive CMOS-compatible platform for nonlinear ***-quality-factor microresonators(Q=4×10^(6))are fabricated on 4H-SiC-on-insulator thin films,where a single soliton microcomb is *** addition,we observe wide spectral translation of chaotic microcombs from near-infrared to visible due to the second-order nonlinearity of *** work highlights the prospects of SiC for future low-loss integrated nonlinear and quantum photonics that could harness electro-opto-mechanical interactions on a monolithic platform.

关键词： soliton visible insulator

Emerging material platforms for integrated microcavity photonics

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Science China(Physics,Mechanics & Astronomy) 2022年第10期65卷 10-28页

作者： Jin Liu Fang Bo Lin Chang chun-hua dong Xin Ou Blake Regan Xiaoqin Shen Qinghai Song Baicheng Yao Wenfu Zhang Chang-Ling Zou Yun-Feng Xiao State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-sen UniversityGuangzhou 510000China MOE Key Laboratory of Weak-Light Nonlinear Photonics TEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300071China State Key Laboratory of Advanced Optical Communications System and Networks School of ElectronicsPeking UniversityBeijing 100871China CAS Key Lab of Quantum Information University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Functional Material for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China School of Mathematical and Physical Sciences University of Technology SydneyUltimo 2007Australia School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Harbin Institute of TechnologyShenzhen 518055China Key Laboratory of Optical Fiber Sensing and Communications(Ministry of Education) University of Electronic Science and Technology of ChinaChengdu 611731China State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China

Many breakthroughs in technologies are closely associated with the deep understanding and development of new material *** the main material used in microelectronics,Si also plays a leading role in the development of integrated *** indirect bandgap,absence ofχ(2)nonlinearity and the parasitic nonlinear absorptions at the telecom band of Si imposed technological bottlenecks for further improving the performances and expanding the functionalities of Si microcavities in which the circulating light intensity is dramatically *** past two decades have witnessed the burgeoning of the novel material platforms that are compatible with the complementary metal-oxide-semiconductor(COMS)*** particular,the unprecedented optical properties of the emerging materials in the thin film form have resulted in revolutionary progress in microcavity *** this review article,we summarize the recently developed material platforms for integrated photonics with the focus on chip-scale microcavity *** material characteristics,fabrication processes and device applications have been thoroughly discussed for the most widely used new material *** also discuss open challenges and opportunities in microcavity photonics,such as heterogeneous integrated devices,and provide an outlook for the future development of integrated microcavities.

关键词： microcavity integrated optics nonlinear optics

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Asymmetric resonant cavities and their applications in optics and photonics: a review

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Frontiers of Optoelectronics 2010年第2期3卷 109-124页

作者： Yun-Feng XIAO Chang-Ling ZOU Yan LI chun-hua dong Zheng-Fu HAN Qihuang GONG State Key Lab for Mesoscopic Physics School of Physics Peking University Key Laboratory of Quantum Information University of Science and Technology of China

Asymmetric resonant cavities(ARCs) with smoothly deformed boundaries are currently under intensive study because they possess distinct properties that conventional symmetric cavities cannot provide. On one hand, it has been demonstrated that ARCs allow for highly directional emission instead of the in-plane isotropic light output in symmetric whispering-gallery cavities, such as microdisks, microspheres, and microtoroids. On the other hand, ARCs behave like open billiard system and thus offer an excellent platform to test classical and quantum chaos. This article reviews the recent progresses and prospects for the experimental realization of ARCs, with applications toward highly directional microlasing, strongcoupling light-matter interaction, and highly sensitive biosensing.

关键词： asymmetric resonant cavity (ARC) directional emission quality factor whispering gallery mode chaos

Realization of quantum ground state in an optomechanical crystal cavity

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Science China(Physics,Mechanics & Astronomy) 2023年第12期66卷 110-118页

作者： Yu Wang Zhi-Peng Shi Hong-Yi Kuang Xiang Xi Shuai Wan Zhen Shen Pi-Yu Wang Guan-Ting Xu Xiankai Sun Chang-Ling Zou Guang-Can Guo chun-hua dong CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230088China Department of Electronic Engineering The Chinese University of Hong KongHong KongChina Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Ground-state cooling of the mechanical degree of freedom is a fundamental requirement for quantum state transfer between relevant optical and mechanical ***,we fabricate optomechanical crystal cavities with co-localized mechanical and optical modes on a monolithic *** typical linewidth of the optical modes at telecom wavelength is as low as 0.95 GHz,and the mechanical resonant frequency is around 5 GHz,which means the optomechanical system can be operated in the resolved sideband *** the statistics of the asymmetry in the scattering rates of red and blue detuning driving processes,we initialize and characterize the mechanical system in its quantum ground-state of motion,with a mean thermal phonon occupancy nth=0.018±0.0034,corresponding to a mode temperature of 57.3 m *** is a general platform for quantum state transfer between relevant optical and mechanical systems,as well as the quantum entanglement between these systems.

关键词： microcavity cavity optomechanics optomechanical crystal cavity quantum ground state

Stimulated Brillouin interaction between guided phonons and photons in a lithium niobate waveguide

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Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 173-175页

作者： Yuan-Hao Yang Jia-Qi Wang Zheng-Xu Zhu Xin-Biao Xu Qiang Zhang Juanjuan Lu Yu Zeng chun-hua dong Luyan Sun Guang-Can Guo Chang-Ling Zou CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China School of Information Science and Technology ShanghaiTech UniversityShanghai 201210China Center for Quantum Information Institute for Interdisciplinary Information SciencesTsinghua UniversityBeijing 100084China

The Brillouin scattering is one of the strongest nonlinear optical effects in dielectrics[1].In particular,the backward Brillouin scattering(BBS)provides an efficient method to achieve low-noise optical gain for active photonics[2]and the coherent interconnects between 10 GHz phonons and photons[3].However,previous studies on BBS are primarily limited to the unconfined phonons[1]or phonon confined in suspended structures[4-6].

关键词： scattering waveguide Brillouin