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Picotesla fiberized diamond-based AC magnetometer

Photonics Research 2024年第6期12卷 1250-1261页

作者： SHAO-CHUN ZHANG YONG LIU LONG-KUN SHAN XUE-DONG GAO JIA-QI GENG CUI YU YANG DONG XIANG-DONG CHEN GUANG-CAN GUO FANG-WEN SUN 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 National Key laboratory of ASIC Hebei Semiconductor Research InstituteShijiazhuang 050051China electric power quantum sensing joint laboratory of anhui province State Grid Anhui Electric Power Research InstituteHefei 230601China Hefei National laboratory University of Science and Technology of ChinaHefei 230088China

Portable quantum sensors are crucial for developing practical quantum sensing and metrology *** nitrogen-vacancy(NV)centers in diamonds have emerged as one of the most promising candidates for compact quantum ***,due to the difficulty of coherently controlling the ensemble spin and noise suppression in a large volume,it often faces problems such as reduced sensitivity and narrowed bandwidth in integrated lensless ***,we propose a fluorescence signal treatment method for NV spin ensemble manipulation by the exponential fitting of spin polarization processes,instead of integrating the photon *** enables spin state readout with a high signal-to-noise ratio and applies to the pulse sensing protocols for large-volume NV *** on this,we further developed a fiberized diamond-based AC *** an XY8-N dynamical decoupling pulse sequence,we demonstrated a T_(2)-limited sensitivity of 8pT/√Hz and T_(1)-limited frequency resolution of 90 Hz over a wide frequency band from 100 kHz to 3 *** integrated diamond sensor leverages quantum coherence to achieve enhanced sensitivity in detecting AC magnetic fields,making it suitable for implementation in a compact and portable endoscopic sensor.

关键词： magnetometer quantum ensemble

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Entanglement quantification via weak measurements assisted by deep learning

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Photonics Research 2024年第4期12卷 712-719页

作者： MU YANG YA XIAO ZE-YAN HAO YU-WEI LIAO JIA-HE CAO KAI SUN EN-HUI WANG ZHENG-HAO LIU YUTAKA SHIKANO JIN-SHI XU CHUAN-FENG LI GUANG-CAN GUO CAS Key laboratory of quantum Information University of Science and Technology of ChinaHefei 230026China College of Physics and Optoelectronic Engineering Ocean University of ChinaQingdao 266100China CAS Center for Excellence in quantum Information and quantum Physics University of Science and Technology of ChinaHefei 230026China Hefei National laboratory University of Science and Technology of ChinaHefei 230088China electric power Research Institute State Grid Anhui Electric Power Co.Ltd.Hefei 230601China Institute of Systems and Information Engineering University of TsukubaIbaraki 305-8573Japan Center for Artificial Intelligence Research University of TsukubaIbaraki 305-8577Japan Graduate School of Science and Technology Gunma UniversityGunma 371-8510Japan Institute for quantum Studies Chapman UniversityOrangeCalifornia 92866USA JST PRESTO Saitama 332-0012Japan

Entanglement has been recognized as being crucial when implementing various quantum information ***, quantifying entanglement for an unknown quantum state requires nonphysical operations or post-processing measurement data. For example, evaluation methods via quantum state tomography require vast amounts of measurement data and likely estimation.

关键词： estimation quantum angle

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Low-energy spin dynamics in a Kitaev material Na_(3)Ni_(2)BiO_(6) investigated by nuclear magnetic resonance

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Chinese Physics B 2024年第6期33卷 518-524页

作者：史昕雨崔祎上官艳艳徐霄宇吴占龙胡泽李硕杜柯帆陈颖马龙刘正鑫温锦生张金珊于伟强 Mathematics and Physics Department North China Electric Power UniversityBeijing 102206China Department of Physics and Beijing Key laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Key laboratory of quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China National laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing 210093China anhui province Key laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryChinese Academy of SciencesHefei 230031China Innovative Center for Advanced Microstructures Nanjing UniversityNanjing 210093China

We perform ^(23)Na nuclear magnetic resonance(NMR) and magnetization measurements on an S=1,quasi-2D honeycomb lattice antiferromagnet Na_(3)Ni_(2)BiO_(6).A large positive Curie-Weiss constant of 22.9 K is *** NMR spectra at low fields are consistent with a zigzag magnetic order,indicating a large easy-axis *** the field applied along the c*axis,the NMR spectra confirm the existence of a 1/3-magnetization plateau phase between 5.1 T and 7.1 *** transition from the zigzag order to the 1/3-magnetization plateau phase is also found to be a first-order type.A monotonic decrease of the spin gap is revealed in the 1/3-magnetization plateau phase,which reaches zero at a quantum critical field H_(C)≈8.35 T before entering the fully polarized *** data suggest the existence of exchange frustration in the system along with strong ferromagnetic interactions,hosting the possibility for Kitaev ***,well below the ordered phase,the 1/T_(1) at high fields shows either a level off or an enhancement upon cooling below 3 K,which suggests the existence of low-energy fluctuations.

关键词： one–third magnetization plateau phase nuclear magnetic resonance honeycomb-lattice antiferromagnet Kitaev interaction

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Broadband,Polarization-Sensitive,and Self-powered High-Performance Photodetection of Hetero-Integrated MoS_(2)on Lithium Niobate

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Research 2024年第2期2023卷 203-212页

作者： Zhigang He Heyuan Guan Xijie Liang Junteng Chen Manyan Xie Kaiwen Luo Ran An Liang Ma Fengkai Ma Tiefeng Yang Huihui Lu Guangdong Provincial Key laboratory of Optical Fiber sensing and Communications Jinan UniversityGuangzhou 510632China Key laboratory of Optoelectronic Information and sensing Technologies of Guangdong Higher Education Institutes Jinan UniversityGuangzhou 510632China institute of Fluid Physics China Academy of Engineering PhysicsMianyang 621900China College of Physics and Electronic Engineering Hengyang Normal UniversityHengyang 421008China

High-performance photodetectors hold promising potential in optical communication and imaging ***,conventional counterparts are suffering narrow detection range,high power consumption,and poor polarization *** originating from switchable polarization in ferroelectrics can be used to optimize the photo-to-electric procedure and improve the photodetection *** this regard,we constructed a configuration by integrating 2-dimensional molybdenum disulfide(MoS_(2))with ferroelectric lithium niobate(LiNbO_(3)),resulting in the MoS_(2)/LiNbO_(3)heterostructured *** from the pyroelectric effect of LiNbO_(3),the limitation of bandgap on the detection range can be broken,thus broadening the response band of the detector to 365 to 1,064 nm,as well as enabling the self-powered ***,high carrier mobility and decent light absorbance of MoS_(2)introduce robust light-matter interactions with the underlying LiNbO_(3),leading to ultrafast rise/fall times of≈150μs/250μs and switching ratios of up to≈***,the highest responsivity,specific detectivity,and external quantum efficiency achieved were 17.3 A·W^(-1),4.3×10^(11)Jones,and 4,645.78%,***,because of the anisotropy of the spontaneous-polarized LiNbO_(3)substrate,the photocurrent of the device achieved a dichroic ratio of 7.42,comparing favorably to most MoS_(2)-based *** work demonstrates the integration potential between ferroelectric LiNbO_(3)and 2-dimensional materials for high-performance photodetection.

关键词： polarization ferroelectric Polarization

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基于里德堡原子电场传感的计量、通信以及混合量子系统

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Science Bulletin 2024年第10期69卷 1515-1535页

作者：张好马宇廖开宇杨文广刘宗凯丁冬生颜辉李文辉张临杰 State Key laboratory of quantum Optics and quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China CAS Key laboratory of quantum Information University of Science and Technology of ChinaHefei 230036China Key laboratory of Atomic and Subatomic Structure and quantum Control(Ministry of Education) Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of MatterSchool of PhysicsSouth China Normal UniversityGuangzhou 510006China Centre for quantum Technologies National University of SingaporeSingapore 117543Singapore Hefei National laboratory Hefei 230088China

Rydberg atoms-based electric field sensing has developed rapidly over the past decade.A variety of theoretical proposals and experiment configurations are suggested and realized to improve the measurement metrics,such as intensity sensitivity,bandwidth,phase,and *** Stark effect and electromagnetically induced transparency(EIT)or electromagnetically induced absorption(EIA)are fundamental physics principles behind the ***,various techniques such as amplitude-or frequency-modulation,optical homodyne read-out,microwave superheterodyne and frequency conversion based on multi-wave mixing in atoms are utilized to push the metrics into higher *** this review,different technologies and the corresponding metrics they had achieved were presented,hoping to inspire more possibilities in the improvement of metrics of Rydberg atom-based electric field sensing and broadness of application scenarios.

关键词： Rydberg atom electric field sensing Atomic sensor

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A self-power photodetector based on controlled growth of single crystal MAPbBr_(3)/WO_(3) heterojunction

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中国科学:技术科学英文版 2023年第9期66卷 2660-2668页

作者： YAO JianFeng ZHANG Hu LU JunZheng YANG LiangPan LIU DuanWangDe HU YaLi ZENG Wei GUI PengBin CHEN ZhiLiang REN XinGang Information Materials and Intelligent sensing laboratory of anhui province Anhui UniversityHefei 230039China anhui province Key laboratory of Target Recognition and Feature Extraction Lu’an 237009China Hefei Comprehensive National Science Center Hefei 230601China School of Physics and Electronic Engineering Hubei University of Arts and ScienceXiangyang 441053China

Compared with polycrystalline films, perovskite single crystal is considered as a promising photoelectric material due to its unique advantages in quantum efficiency and carrier diffusion length. In this work, the micron-thickness MAPbBr_(3) single crystal was prepared through a highly repeatable process based on the crystal seed dissolution-growth method. A heterojunction of MAPbBr_(3)/WO_(3) single crystal was realized through a simple thermal evaporation process, and the integrated C/MAPbBr_(3)/WO_(3)/C device demonstrated self-powered characteristics and high photoelectric performance, which showed good responsivity of about 111 mA/W, detectivity of 9.64×10^(11) Jones and fast response speed(0.11/0.56 ms). Meanwhile, the device exhibited good rectification performance(ratio of 125 at ±2 V) and reduced dark current due to the built-in electric field formed in the heterojunction. This study provides a facile, flexible, and highly repeatable method for the preparation of high-performance photodetectors based on MAPbBr_(3) single crystals with micrometer thickness.

关键词： perovskite single crystal heterojunction self-powered photodetectors

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High energy storage properties in Ca_(0.7)La_(0.2)TiO_(3)-modified NaNbO_(3)-based lead-free antiferroelectric ceramics

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Journal of Advanced Dielectrics 2023年第1期13卷 17-24页

作者： Cen Liang Changyuan Wang Wenjun Cao Hanyu Zhao Feng Li Chunchang Wang laboratory of Dielectric Functional Materials School of Materials Science and Engineering Anhui University HefeiAnhui 230601P.R.China Information Materials and Intelligent sensing laboratory of anhui province Key laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Institutes of Physical Science and Information TechnologyAnhui University HefeiAnhui 230601P.R.China

In this work,(1−x)(0.92NaNbO_(3)-0.08BaTiO_(3))-xCa_(0.7)La_(0.2)TiO_(3)(NNBT-xCLT)ceramics were successfully designed and prepared by the solid-state reaction *** on the structure,dielectric,and energy storage properties were *** NNBT-0.25CLT ceramic with orthorhombic phase at room temperature was found to exhibit extremely small grain size and compacted microstructure.A large Wrec of 3.1 J/cm^(3) and a highηof 91.5%under the electric field of 360 kV/cm were achieved simultaneously in the *** addition,the energy storage performance of the sample exhibits thermal stability over the temperature range of 25-140°C and the frequency range of 5-500 *** charge and discharge tests reveal that the ceramic shows a large current density CD of 965 A/cm2 and power density PD of 154 MW/cm^(3).This work demonstrates that the NNBT-0.25CLT ceramic is a prospective energy storage material for potential application in the field of pulsed power devices.

关键词： Lead-free NaNbO_(3)-based ceramics phase transition energy storage charge discharge performance

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Super-sensitive detection of quantum interferometer in atmospheric environment

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Science China(Information Sciences) 2017年第3期60卷 195-201页

作者： Yihua HU Shilong XU State key laboratory of Pulsed power Laser Electronic Engineering Institute Key laboratory of Electronic Restriction of anhui province

With squeezed states or entangled states being the source, quantum metrology, imaging and sensing can break the standard quantum limit(SQL), even reach the Heisenberg limit(HL), which is difficult to achieve by traditional methods. However, the photon loss or phase fluctuation caused by the atmospheric attenuation and turbulence cannot be ignored in the actual application. Atmospheric transmittance and phase fluctuation are related to the detection distance, and the phase sensitivity becomes worse as the distance increases. As the functions of distance, the photon loss and phase fluctuation are uniformly expressed according to the introduction of atmospheric attenuation coefficient, turbulence structure constant and receive aperture size in this *** density matrixes and phase sensitivities of N00 N states and M&M′ states in the atmospheric environment are proposed in terms of distance variables. Then the quantitative computation of super-sensitive distance is carried out. SQL-contour is proposed to describe the super-sensitive ability of the quantum interferometer for the affection from both photon loss and phase fluctuation. The simulation results show that, in atmospheric environment the super-sensitive distance can reach hundreds of meters. M&M′ states with less total photon number are more likely to reflect the advantage of super-sensitivity. SQL-contour can provide references for interferometric source choosing.

关键词： quantum interferometer standard quantum limit entangled states phase sensitivity atmospheric transmission

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Optical properties of Nd^(3+) ions doped GdTaO_(4) for pressure and temperature sensing

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Journal of Rare Earths 2022年第6期40卷 870-877,I0001页

作者： Pengyu Zhou Qingli Zhang Fang Peng Baoquan Sun Xiuming Dou Bao Liu Dandan Han Yongzhou Xue Kun Ding School of Science Northeast Electric Power UniversityJilin 132012China Key laboratory of Photonic Devices and Materials Anhui Institute of Optics and Fine MechanicsChinese Academy of SciencesHefei 230031China State Key laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

Pressure-and temperature-dependent luminescence properties of ^(3)F_(3/2)→^(4)I9/2 transition of Nd^(3+):GdTaO_(4) were studied for potential applications in optical *** isolated emission lines corresponding to^(3)F_(3/2)(R2,1)→^(4)I_(9/2)(Z5)transitions,located at 920 and 927 nm under ambient condition,are very sensitive to pressure with coefficients of-15.6 and-14.5 cm^(-1)/GPa determined in a pressure range up to about 9 *** luminescence intensity ratio between the two emission lines exhibits a large dependence with temperature in a range from 80 to 620 K,the corresponding temperature sensitivity at room temperature is similar to that of Nd^(3+):*** advantages,together with the other observed features of high stable position relationship under pressure and low thermal shifts for the two emission lines indicate that Nd^(3+):GdTaO_(4) is a promising candidate to be used as pressure and temperature sensors in the near-infrared spectral range.

关键词： Trivalent neodymium ion Rare-earth tantalate Near-infrared luminescence Pressure sensing Temperature sensing

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Entanglement Evolution of Three-Qubit States under Local Decoherence

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Communications in Theoretical Physics 2010年第7期54卷 79-83页

作者：马小三刘高生王安民 School of electric Engineering and Information Anhui University of Technology Key laboratory of power Electronics and power Transmission Anhui University of Technology Department of Modern Physics University of Science and Technology of China

By using negativity as entanglement measure,we have investigated the effect of local decoherence from anon-Markovian environment on the time evolution of entanglement of three-qubit states including the GHZ state,the Wstate,and the Werner *** the results,we find that the entanglement dynamics depends not only on the couplingstrengths but also on the specific states of ***,the entanglement takes different behaviors under weakor strong coupling and it varies with the quantum states under *** entanglement of the GHZ state and theWerner state can be destroyed completely by the local decoherence,while the entanglement of the W state can survivethrough the local decoherence partially.

关键词：时间演化纠缠态消相干量子位马尔可夫环境 GHZ态相干效应强耦合

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