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Measurement of atmospheric non-reciprocity effects for satellite-based two-way time-frequency transfer

Photonics Research 2024年第6期12卷 1274-1282页

作者： TING ZENG QI SHEN YUAN CAO jian-YU GUAN MENG-ZHE LIAN JIN-jian HAN LEI HOU jian LU XIN-XIN PENG MIN LI wei-YUE LIU JIN-CAI WU YONG WANG JUAN YIN JI-GANG REN HAI-FENG jianG QIANG ZHANG CHENG-ZHI PENG jian-wei pan Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Shanghai Research Center for Quantum Science and CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaShanghai 201315China Hefei National Laboratory University of Science and Technology of ChinaHefei 230094China Faculty of Information Science and Engineering Ningbo UniversityNingbo 315211China Key Laboratory of Space Active Opto-Electronic Technology Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China

Future optical clock networks will require high-precision optical time-frequency transfer between satellites and ground ***,due to atmospheric turbulence,satellite motion and time delay between the satellite–ground transmission links will cause spatial and temporal variations,respectively,resulting in the breakdown of the time-of-flight reciprocity on which optical two-way time-frequency transfer is ***,we experimentally simulate the atmospheric effects by two-way spatio-temporally separated links between two stationary terminals located 113 km apart and measure the effects for optical two-way time-frequency *** experiment shows that the effect on the link instability is less than 2.3×10^(−19) at 10,000 *** indicates that when the link instability of satellite-ground optical time-frequency transfer is on the order of 10^(−19),it is not necessary to consider the atmospheric non-reciprocity effects.

关键词： breakdown transfer satellite

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On-Demand Photon Storage and Retrieval with a Solid-State Photon Molecule at Room Temperature

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Electromagnetic Science 2024年第3期2卷 42-51页

作者： Ze-Yu Luo Tong Zhang Yi-Teng Ye Yun-Fei Wang Cheng-Cheng Yu Zhi-Cong Luo Yi-Jie Zhang Mo-Chi Xu Barry CSanders Hui Wang Chao-Yang Lu jian-wei pan Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences 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 Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China Institute for Quantum Science and Technology University of CalgaryCalgary T2N 1N4Canada

Deterministically achieving on-chip photon storage and retrieval is a fundamental challenge for integrated ***,this requirement is increasingly urgent as photon storage and retrieval is crucial to realize truly scalable room-temperature quantum ***,most of existing quantum memories integrated on chips must either work at cryogenic temperature or else are strongly coupled with the environment,which hugely reduces the ***,we propose an on-chip room-temperature quantum memory comprising three coupled microcavities,which presents an ideal dark state decoupled by a waveguide,thereby allowing on-demand photon storage and retrieval with high efficiency and high fidelity ***,we demonstrate that the single-photon temporal duration can be increased or decreased by a factor of 10^(3),thereby enabling many crucial quantum *** error-robust approach highlights the potential for a solid-state photonic molecule for use as on-chip quantum memory and for optical quantum computing.

关键词： Photon storage and retrieval On-chip quantum memory Photon temporal shaping

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Advances in InGaAs/InP single-photon detector systems for quantum communication

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Light(Science & Applications) 2015年第1期4卷 381-393页

作者： Jun Zhang Mark A Itzler Hugo Zbinden jian-wei pan Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of ChinaHefeiAnhui 230026China CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefeiAnhui 230026China Princeton Lightwave Inc. 2555 US Route 130 S.CranburyNJ 08540 USA Group of Applied Physics University of GenevaGeneva CH-1211Switzerland

Single-photon detectors(SPDs)are the most sensitive instruments for light *** the near-infrared range,SPDs based on III–V compound semiconductor avalanche photodiodes have been extensively used during the past two decades for diverse applications due to their advantages in practicality including small size,low cost and easy *** the past decade,the rapid developments and increasing demands in quantum information science have served as key drivers to improve the device performance of single-photon avalanche diodes and to invent new avalanche quenching *** Review aims to introduce the technology advances of InGaAs/InP single-photon detector systems in the telecom wavelengths and the relevant quantum communication applications,and particularly to highlight recent emerging techniques such as high-frequency gating at GHz rates and free-running operation using negative-feedback avalanche *** perspectives of both the devices and quenching techniques are summarized.

关键词： avalanche photodiode detector InGaAs/InP quantum communication single-photon avalanche diode single-photon detection

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Precision mapping the topological bands of 2D spin-orbit coupling with microwave spin-injection spectroscopy

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Science Bulletin 2018年第22期63卷 1464-1469页

作者： Xiao-Tian Xu Chang-Rui Yi Bao-Zong Wang wei Sun Youjin Deng Xiong-Jun Liu Shuai Chen jian-wei pan Shanghai Branch National Research Center for Physical Sciences at Microscale and Department of Modern PhysicsUniversity of Science and Technology of ChinaShanghai 201315China Chinese Academy of Sciences Center for Excellence:Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230326China International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China

To investigate the band structure is one of the key approaches to study the fundamental properties of a novel *** report here the precision band mapping of a 2-dimensional(2D) spin-orbit(SO) coupling in an optical *** applying the microwave spin-injection spectroscopy, the band structure and spin-polarization distribution are achieved *** band topology is also addressed with observing the band gap close and re-open at the Dirac ***, the lattice depth and the Raman coupling strength are precisely calibrated with relative errors in the order of 10^(-3).Our approach could also be applied for exploring the exotic topological phases with even higher dimensional system.

关键词： 2D spin-orbit coupling Microwave spin-injection spectroscopy Spin polarization Topological band Topological phase transition

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Production of an ultracold mixture of ^(23)Na^(40)K and ^(40)K

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Science China(Physics,Mechanics & Astronomy) 2022年第2期65卷 39-43页

作者： Xin-Yao Wang Zhen Su Jin Cao Huan Yang Bo Zhao Chun-Li Bai jian-wei pan Beijing National Laboratory for Molecular Sciences Key Laboratory of Molecular Nanostructure and NanotechnologyCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Shanghai Branch CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaShanghai 201315China A Shanghai Research Center for Quantum Sciences Shanghai 201315China University of Chinese Academy of Sciences Beijing 100049China

We report on the production of an ultracold mixture of 2.8×10^(4)^(23)Na^(40)K molecules and 3.3×10^(5)^(40)K atoms at a temperature of about 250 n *** with previous studies,the number of atoms and molecules improved by a factor of about 2,and the temperature reduced by a factor of about *** improvements occur mainly because of the use of a crossed large-volume horizontal dipole trap to load the atoms from a cloverleaf-type magnetic trap,and a large-volume three-beam dipole trap to perform optical evaporative *** achieving the mode-matching loading,this method avoids evaporative cooling in a decompressed cloverleaf magnetic trap,which is sensitive to magnetic field *** characterize an atom-molecule Feshbach resonance using the ultracold atom-molecule *** enhancement of particle number and temperature significantly improves the signal-to-noise ratio,and enables us to refine the location and width of the Feshbach resonance.

关键词： ultracold molecule Bose-Fermi mixture Feshbach resonance

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Optimal readout of superconducting qubits exploiting high-level states

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Fundamental Research 2021年第1期1卷 16-21页

作者： Can Wang Ming-Cheng Chen Chao-Yang Lu jian-wei pan Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of ChinaHefeiAnhui 230026China CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefeiAnhui 230026China

High-fidelity initialization,manipulation,and measurement of qubits are important in quantum *** the Google’s Sycamore processor,the gate fidelity of single-and two-qubit logic operations has improved to>99.6%,whereas single-shot measurement fidelity remains at the level of 97%,which severely limits the ap-plication of the superconducting approach to large-scale quantum *** current measurement scheme relies on the dispersive interaction between the qubit and the readout resonator,which was proposed back in ***,the measurement fidelity is limited by the trade-offbetween the state separation and relax-ation time of the two-level ***,an exciting phenomenon was observed experimentally,wherein the separation-decay limit could be alleviated by exploiting the cascade decay nature of the higher levels;however,the mechanism and effectiveness of this phenomenon are still ***,we present a theoretical tool to extract different types of errors in high-level states encoding dispersive *** the realistic parame-ters of Google’s Sycamore processor,the use of state|2>is sufficient to suppress 92%of the decay readout error on average,where the total readout error is dominated by the background thermal *** also show counter-intuitively that,the assistance of high-level states is effective in the measurement of logic 0,where there is no decay process.

关键词： Dispersive measurement Transmon Superconducting qubit Quantum computation

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Emergence of classical objectivity of quantum Darwinism in a photonic quantum simulator

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Science Bulletin 2019年第9期64卷 580-585页

作者： Ming-Cheng Chen Han-Sen Zhong Yuan Li Dian Wu Xi-Lin Wang Li Li Nai-Le Liu Chao-Yang Lu jian-wei pan Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics University of Science and Technology of China

Quantum-to-classical transition is a fundamental open question in physics frontier. Quantum decoherence theory points out that the inevitable interaction with environment is a sink carrying away quantum coherence, which is responsible for the suppression of quantum superposition in open quantum ***, quantum Darwinism theory further extends the role of environment, serving as communication channel, to explain the classical objectivity emerging in quantum measurement process. Here, we used a six-photon quantum simulator to investigate classical and quantum information proliferation in quantum Darwinism process. In the simulation, many environmental photons are scattered from an observed quantum system and they are collected and used to infer the system's state. We observed redundancy of system's classical information and suppression of quantum correlation in the fragments of environmental photons. Our results experimentally show that the classical objectivity of quantum system can be established through quantum Darwinism mechanism.

关键词： Quantum measurement Quantum Darwinism Hovelo bound Quantum discord Single photons

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Observation of the density dependence of the closed-channel fraction of a 6Li superfluid

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National Science Review 2022年第10期9卷 105-111页

作者： Xiang-Pei Liu Xing-Can Yao Hao-Ze Chen Xiao-Qiong Wang Yu-Xuan Wang Yu-Ao Chen Qijin Chen Kathryn Levin jian-wei pan Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of China Shanghai Branch CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai Research Center for Quantum Sciences James Franck Institute University of Chicago

Atomic Fermi gases provide an ideal platform for studying pairing and superfluid physics,using a Feshbach resonance between closed-channel molecular states and open-channel scattering *** particular interest is the strongly interacting *** show that the closed-channel fraction Zccprovides an effective probe for important many-body interacting effects,especially through its density dependence,which is absent from two-body theoretical *** we measure Zccas a function of interaction strength and the Fermi temperature TF in a trapped 6Li superfluid throughout the entire Bardeen-Cooper-Schrieffer-Bose-Einstein-condensate crossover,in quantitative agreement with theory when important thermal contributions outside the superfluid core are taken into *** from the deep-BEC regime,the fraction Zccis sensitive to *** particular,our data show Zcc∝TFαwith α=1/2at unitarity,in quantitative agreement with calculations of a two-channel pairing fluctuation theory,and a increases rapidly into the BCS regime,reflecting many-body interaction effects as predicted.

关键词： closed-channel fraction density dependence strongly interacting Fermi gas many-body effect

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High toughness and CMAS resistance of REAlO_(3)/RE_(2)Zr_(2)O_(7)(RE=La,Nd,Sm,Eu,Gd,and Dy)composites with eutectic composition for thermal barrier coatings

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Journal of Advanced Ceramics 2024年第6期13卷 800-809页

作者： Zijian Zhang jian Sun Guanghua Liu Yi Han wei Liu Yi Li wei Wang Xiangyang Liu Peng Zhang wei pan Chunlei Wan State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China China United Gas Turbine Technology Co. Ltd.Beijing 100015China College of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China College of Materials Science and Engineering Beijing University of TechnologyBeijing 100124China

Although rare earth zirconates(RE_(2)Zr_(2)O_(7))have garnered attention as viable candidates for thermal barrier coatings(TBCs),they suffer from low fracture toughness and accelerated calcium–magnesium–alumina–silicate(CMAS)melt corrosion at high service temperatures,which impedes their practical *** this work,we developed a series of REAlO_(3)/RE_(2)Zr_(2)O_(7)(RE=La,Nd,Sm,Eu,Gd,and Dy)composites with a eutectic composition that not only significantly enhanced the fracture toughness by more than 40%relative to that of RE_(2)Zr_(2)O_(7)but also exhibited improved resistance to CMAS *** increase in toughness arises from multiple mechanisms,such as ferroelastic toughening,fine-grain strengthening,and residual stress toughening,all of which trigger more crack defects and energy ***,the CMAS penetration depth of the REAlO_(3)/RE_(2)Zr_(2)O_(7)composites is approximately 36%lower than that of RE_(2)Zr_(2)O_(7).Al–O constituents in composites can capture CaO,SiO_(2),and MgO in CMAS melts and increase their viscosity,resulting in enhanced CMAS corrosion *** thermophysical properties of the REAlO_(3)/RE_(2)Zr_(2)O_(7)composites were also investigated,and their coefficient of thermal expansion and thermal conductivity are comparable to those of 7–8 wt%Y_(2)O_(3)partially stabilized ZrO2(YSZ),indicating their potential as TBC materials.

关键词： fracture toughness thermal property calcium-magnesium-alumina-silicate(CMAS)corrosion REAlO_(3)/RE_(2)Zr_(2)O_(7) eutectic composition

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Effect of alumina occurrence form on metallurgical properties of hematite and magnetite pellets

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Journal of Iron and Steel Research International 2024年第4期31卷 797-809页

作者： jian pan Chen-mei Tang Cong-cong Yang De-qing Zhu Zheng-qi Guo wei-qun Huang School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina Exploration and Development of Geology and Mineral Resources Co. Ltd.Nanchang 330030JiangxiChina

The effect of alumina occurrence form on the metallurgical properties of both hematite and magnetite pellets was investigated at the same Al_(2)O level of 2 wt.%,including reduction index(RI),low-temperature reduction disintegration index(RDI),reduction swelling index(RSI),and high-temperature softening-dripping *** mineralogy of fired pellets was also studied to reveal the influence of alumina occurrence form on the phase composition and *** the results,the alumina occurrence form presents tremendous impacts on the metallurgical perfor-mance of both magnetite and hematite *** of all alumina occurrence forms contributes to inferior reducibility of pellets,especially in the case of gibbsite for magnetite pellets with a RI of 58.4%and kaolinite for hematite pellets with a RI of 56.8%.However,addition of all alumina occurrence forms improves the RDI of magnetite pellets,while there is no significant difference among various alumina occurrence *** contrast,alumina occurrence forms have little influence on the RDI of hematite *** presence of free alumina,gibbsite,and kaolinite tends to improve the RSI of hematite and magnetite pellets,whereas hercynite gives the opposite trend with a RSI of 25.6%.For softening-dripping performance of magnetite pellets,all alumina occurrence forms contribute to narrower softening-melting ***,alumina,gibbsite,and kaolinite give narrower softening-dripping interval,at 229,217,and 88℃,respectively,whereas addition of hercynite results in the largest melting range at 276℃ due to its high melting *** hematite pellets,free alumina,gibbsite,and hercynite tend to enlarge melting range,whereas kaolinite contributes to lower dripping temperature of 1148℃ and narrow softening-dripping interval of 88℃ due to the formation of a greater amount of slag phase at high temperatures.

关键词： Oxidized pellet Magnetite Hematite Alumina occurrence form Metallurgical performance Blast furnace

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