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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

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

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

A Case Report of Traumatic Posterior Communicating Artery-cavernous Sinus Fistula

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Journal of Cerebrovascular Disease 2018年第1期1卷 32-39页

作者： jian Shen jian-wei pan Department of Neurosurgery The First Affiliated HospitalCollege of MedicineZhejiang UniversityHangzhou 310003China

CLINICAL DATA A 29-year-old Chinese male patient was admitted to our hospital in June 2016 with a diagnosis of traumatic internal carotid cavernous fistula and cranioplasty postoperative infection, suffering from right eye proptosis and scalp infection for one and one-half years. This patient sustained a traumatic brain injury after a motorcycle accident three years earlier, initially diagnosed as “bilateral frontal lobe contusion with hematoma and extensive anterior skull fracture” at a local hospital. Cranial hematoma removal and decompressive craniectomy were performed immediately, with a cranioplasty three months later. One and one-half years ago, a local hospital diagnosed, but did not treat, a carotid cavernous fistula based on a protrusion in the right eye and a pulsatile uplift in the upper part of the right eye socket. Over the past year, these symptoms gradually worsened, but the blurring of the right eye was similar to that after surgery.

关键词： Case Report 29-year-old Chinese male patient right eye

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

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

Hyaluronic Acid-polycaprolactone Nanofibrous Scaffolds: A Possible Device for Nerve Tissue Engineering

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Journal of Cerebrovascular Disease 2019年第1期2卷 25-29页

作者： Feng Xiao jian-wei pan Department of Neurosurgery The First Affiliated HospitalCollege of MedicineZhejiang UniversityHangzhou 310003China

Background: To improve the biological compatibility of pure polycaprolactone (PCL) nanofibrous scaffolds by co-spinning of hyaluronic acid (HA) and PCL,and to evaluate the value of HA-PCL scaffolds in nerve tissue engineering by observing the growth of neural stem cells (NSCs) on them. Methods: Using traditional electrospinning technology,HA and PCL were spun into three kinds of random,aligned,and extremely aligned scaffolds in a ratio of 1:5 and 1:10,and the pure PCL scaffold was prepared at the same time. The sequencing and fiber diameters of various nanofibrous scaffolds were determined by electron microscopy. Then,NSCs were inoculated on the 9 nanofibrous scaffolds,and their proliferation was determined by MTT [3-(4,5-dimethylthiazol-2-yl)-2,5 diphenyl tetrazolium bromide] assay after 5 days. Results: Scaffolds of pure PCL,1:5 HA-PCL,and 1:10 HA-PCL were successfully prepared,whose diameter was about 200 nm and which were divided into random,aligned,and extremely aligned scaffolds by electron microscopy. The MTT assay showed no significant difference in the proliferation of NSCs on 1:10 HA-PCL scaffolds and pure PCL scaffolds. The proliferation of NSCs on 1:5 HA-PCL scaffolds was better than that of 1:10 HA-PCL and pure PCL scaffolds. On the 1:5 HA-PCL scaffold,the more aligned the scaffold is,the faster cells proliferate. Conclusions: HA can effectively increase the tissue compatibility of PCL scaffolds and promote the proliferation of NSCs. The aligned nanofibrous scaffold is more beneficial to the proliferation of NSCs.

关键词： Hyaluronic acid Polycaprolactone Neural stem cells

Experimental Gaussian Boson sampling

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Science Bulletin 2019年第8期64卷 511-515页

作者： Han-Sen Zhong Li-Chao Peng Yuan Li Yi Hu wei Li jian Qin Dian Wu weijun Zhang Hao Li Lu Zhang Zhen Wang Lixing You Xiao jiang Li Li Nai-Le Liu Jonathan P.Dowling 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 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences Hearne Institute for Theoretical Physics and Department of Physics and Astronomy Louisiana State University NYU-ECNU Institute of Physics at NYU Shanghai

Gaussian Boson sampling(GBS) provides a highly efficient approach to make use of squeezed states from parametric down-conversion to solve a classically hard-to-solve sampling problem. The GBS protocol not only significantly enhances the photon generation probability, compared to standard Boson sampling with single photon Fock states, but also links to potential applications such as dense subgraph problems and molecular vibronic spectra. Here, we report the first experimental demonstration of GBS using squeezed-state sources with simultaneously high photon indistinguishability and collection *** implement and validate 3-, 4- and 5-photon GBS with high sampling rates of 832, 163 and 23 kHz,respectively, which is more than 4.4, 12.0, and 29.5 times faster than the previous ***, we observe a quantum speed-up on a NP-hard optimization problem when comparing with simulated thermal sampler and uniform sampler.

关键词： Quantum information Boson sampling Gaussian Boson sampling Squeezed state Quantum advantage Quantum approximate optimization

Postoperative Development of Dural Arteriovenous Fistulas after Aneurysmal Clipping: A Case Report and Literature Review

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Journal of Cerebrovascular Disease 2020年第4期3卷 29-33页

作者： wei-jian Fan Min Yan Hao jiang jian-wei pan Department of Neurosurgery The First Affiliated HospitalZhejiang UniversitySchool of MedicineHangzhou 310006China

Dural arteriovenous fistulas(DAVFs)are rare vascular abnormalities that comprise 10%-15%of all intracranial arteriovenous *** pathogenesis of DAVFs is still uncertain,although growing angiographic evidence supports the acquired characteristics of this vascular ***,we present the case of a 39-year-old man with incidental bilateral paraophthalmic aneurysms who experienced spontaneous retroocular pressure and mild *** resonance angiography revealed enlargement and a change in the shape of the right paraophthalmic *** patient underwent a right pterional craniotomy for the intracranial *** months later,he presented with progressive pulsatile tinnitus.A diagnostic angiogram demonstrated a Cognard type I DAVF of the right sigmoid *** on this case,angiography monitoring is *** we review and summarize postoperative DAVF *** causes of acquired DAVFs and treatment selection are discussed based on relevant literature.

关键词： Acquired dural arteriovenous fistula Pathogenesis Dural sinus thrombosis Arteriovenous shunt Angiogenesis Treatment