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Bosonic quantum error correction codes in superconducting quantum circuits

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Fundamental Research 2021年第1期1卷 50-67页

作者： Weizhou Cai Yuwei Ma Weiting Wang chang-ling zou Luyan Sun Center for Quantum Information Institute for Interdisciplinary Information SciencesTsinghua UniversityBeijing 100084China Key Laboratory of Quantum Information CASUniversity of Science and Technology of ChinaHefeiAnhui 230026P.R.China

Quantum information is vulnerable to environmental noise and experimental imperfections,hindering the reli-ability of practical quantum information ***,quantum error correction(QEC)that can pro-tect quantum information against noise is vital for universal and scalable quantum *** many different experimental platforms,superconducting quantum circuits and bosonic encodings in superconducting microwave modes are appealing for their unprecedented potential in *** the last few years,bosonic QEC is demonstrated to reach the break-even point,*** lifetime of a logical qubit is enhanced to exceed that of any individual components composing the experimental *** that,universal gate sets and fault-tolerant operations on the bosonic codes are also realized,pushing quantum information processing towards the QEC *** this article,we review the recent progress of the bosonic codes,including the Gottesman-Kitaev-Preskill codes,cat codes,and binomial codes,and discuss the opportunities of bosonic codes in various quantum applications,ranging from fault-tolerant quantum computation to quantum *** also summarize the challenges associated with the bosonic codes and provide an outlook for the potential research directions in the long terms.

关键词： Quantum error correction Bosonic codes Superconducting quantum circuits Quantum communication Quantum simulation Quantum metrology

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

Frequency stabilization and tuning of breathing solitons in Si3N4 microresonators

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Photonics Research 2020年第8期8卷 1342-1349页

作者： SHUAI WAN RUI NIU ZHENG-YU WANG JIN-LAN PENG MING LI JIN LI GUANG-CAN GUO chang-ling zou 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 230026China Center for Micro and Nanoscale Research and Fabrication University of Science and Technology of ChinaChinese Academy of SciencesHefei 230026China

Dissipative Kerr solitons offer broadband coherent and low-noise frequency combs and stable temporal pulse trains,having shown great potential applications in spectroscopy,communications,and *** solitons are a particular kind of dissipative Kerr soliton in which the pulse duration and peak intensity show periodic *** we have investigated the breathing dissipative Kerr solitons in silicon nitride(Si3N4)microrings,while the breathing period shows uncertainties of around megahertz(MHz)order in both simulation and *** instability is the main obstacle for future *** applying a modulated signal to the pump laser,the breathing frequency can be injection locked to the modulation frequency and tuned over tens of MHz with frequency noise significantly *** demonstration offers an alternative knob for the control of soliton dynamics in microresonators and paves a new avenue towards practical applications of breathing solitons.

关键词： solitons soliton stabilization

Fabrication of the high-Q Si_(3)N_(4) microresonators for soliton microcombs

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Chinese Optics Letters 2022年第3期20卷 111-116页

作者： Shuai Wan Rui Niu jin-Lan Peng jin Li Guang-Can Guo chang-ling zou 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 230026China Center for Micro and Nanoscale Research and Fabrication University of Science and Technology of ChinaChinese Academy of SciencesHefei 230026China

The microresonator-based soliton microcomb has shown a promising future in many *** this work,we report the fabrication of high quality[Q]Si_(3)N_(4)microring resonators for soliton microcomb *** developing the fabri-cation process with crack isolation trenches and annealing,we can deposit thick stoichiometric Si3N4 film of 800 nm without cracks in the central *** highest intrinsic Q of the Si_(3)N_(4)microring obtained in our experiments is about 6×10^(6),corresponding to a propagation loss as low as 0.058 dBm/*** such a high Q film,we fabricate microrings with the anomalous dispersion and demonstrate the generation of soliton microcombs with 100 mW on-chip pump power,with an optical parametric oscillation threshold of only 13.4 *** Si_(3)N_(4)integrated chip provides an ideal platform for researches and applications of nonlinear photonics and integrated photonics.

关键词： silicon nitride microresonator optical frequency comb dissipative Kerr soliton

Tunable Optical Bandpass Filter via a Microtip-Touched Tapered Optical Fiber

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Chinese Physics Letters 2020年第10期37卷 26-32页

作者： Peng-Fei Zhang Li-Jun Song chang-ling zou Xin Wang Chen-Xi Wang Gang Li Tian-Cai Zhang State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China

We demonstrate a tunable bandpass optical filter based on a tapered optical fiber(TOF)touched by a hemispherical microfiber tip(MFT).Other than the interference and selective material absorption effects,the filter relies on the controllable and wavelength-dependent mode–mode interactions in ***,a large range of tunability is realized by controlling the position of the MFT in contact with the TOF for various TOF radii,and two distinct bandpass filter mechanisms are *** center wavelength of the bandpass filter can be tuned from 890 nm to 1000 nm,while the FWHM bandwidth can be tuned from 110 nm to 240 nm when the MFT touches the TOF in the radius range from 160 nm to 390 *** distinction ratio can reach 28±3 dB *** combined TOF-MFT is an in-line tunable bandpass optical filter that has great application potential in optical networks and spectroscopy,and the principle could also be generalized to other integrated photonic devices.

关键词： tunable fiber Touch

Observation of high-Q optomechanical modes in the mounted silica microspheres

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Photonics Research 2015年第5期3卷 243-247页

作者： Zhen Shen Zhong-Hao Zhou chang-ling zou Fang-Wen Sun Guo-Ping Guo Chun-Hua Dong Guang-Can Guo Key Laboratory of Quantum Information Chinese Academy of SciencesUniversity of Science and Technology of ChinaHefei 230026China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefeiAnhui 230026China

An efficient method to mount a coupled silica microsphere and tapered fiber system is proposed and demonstrated experimentally. For the purpose of optomechanical studies, high-quality-factor optical(Q_o～ 10~8) and mechanical modes(Q_m～ 0.87 × 10~4) are maintained after the mounting process. For the mounted microsphere, the coupling system is more stable and compact and, thus, is beneficial for future studies and applications based on optomechanical interactions. Especially, the packaged optomechanical system, which is tested in a vacuum chamber,paves the way toward quantum optomechanics research in cryostat.

关键词： mode rate Observation of high-Q optomechanical modes in the mounted silica microspheres high

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

Gradient microstructure and superior strength-ductility synergy of AZ61 magnesium alloy bars processed by radial forging with different deformation temperatures

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Journal of Materials Science & Technology 2024年第3期170卷 65-77页

作者： Jingfeng zou Lifeng Ma Yanchun Zhu ling Qin Yuan Yuan School of Mechanical Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Heavy Machinery Engineering Research Center of the Ministry Education Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Engineering University of HullCottingham RdHull HU67RXUK National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China

Gradient microstructure modification is a cost-efficient strategy for high strength without compromising ductility,which is urgently needed in the fundamental science of engineering *** this study,heterogeneous structures of AZ61 alloy bars with anisotropic gradients(with different grain size distributions from the surface to the center)were observed to exhibit strong strength-ductility synergies under different deformation tem *** results reveal that the grain refinement process under mediumlow temperature deformation conditions(≤350℃)consists of four transition stages along the radial direction,i.e.,twin activations and deformation band formations,dislocation cells and pile-ups,ultrafine sub-grains,and randomly orientated quasi-micron *** deformation temperatures have a great influence on twin activations and deformation band formations,and the high temperature can easily provoke the initiation of non-basal *** deformation bands were determined as a primary nucleation site due to their highly unstable dislocation hindrance *** in combination with the Radial forging(RF)deformation process,the differences of dynamic precipitates can be attributed to microstructural difference and solubility limit of Al at different tem *** summarizing the tensile test results,the sample forged at 350℃exhibited the best strength-ductility synergy,exhibiting the highest elongation(EL)of 23.2%with a 251 MPa yield strength(YS)and 394 MPa ultimate tensile strength(UTS)in center region,and combined with the highest strength value of 256 MPa YS and 420 MPa UTS in the center region,while the EL was slightly degraded to 19.8%.

关键词： Gradient microstructure Radial forging Strength-ductility synergy Magnesium alloy Strengthening mechanism