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quantum Griffiths singularity in two-dimensional superconducting 4Ha-TaSe_(2) nanodevices

Nano Research 2023年第10期16卷 12281-12285页

作者： Ying Xing Yiyu Liu Pu Yang Jun Ge Longxin Pan Junyan Wang Shichao Qi Yi Liu Jian Wang State Key Laboratory of Heavy Oil Processing College of New Energy and MaterialsChina University of Petroleum(Beijing)Beijing 102249China International Center for quantum Materials School of PhysicsPeking UniversityBeijing 100871China College of Chemistry Beijing Normal UniversityBeijing 100875China Department of physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Collaborative innovation Center of quantum Matter Beijing 100871China Hefei National Laboratory Hefei 230088China Beijing academy of quantum information sciences Beijing 100193China CAS Center for excellence in Topological quantum Computation University of Chinese Academy of SciencesBeijing 100190China

The layered transition metal dichalcogenides(TMDs)have raised considerable interest in the past decades for both fundamental physics and low-dimensional nanodevice ***,intriguing phenomena of Ising superconductivity and quantum metallic state have been reported in two-dimensional(2D)4Ha-TaSe2 ***,we report the magnetic field induced superconductor–metal transition(SMT)in mechanical exfoliated 4Ha-TaSe2 nanodevices with thickness down to 2.5 *** observe the quantum Griffiths singularity(QGS)of SMT in thin 4Ha-TaSe2 nanodevices by performing ultralow temperature transport measurements and activated scaling *** increasing the thickness of TaSe2 nanodevice to 10.6 nm,the signature of magnetoresistance crossing region can hardly be detected,revealing the thickness dependence of *** this procedure,the disorder strength plays a dominant *** work enriches the platform for studying QGS and may stimulate further investigations on the correlation between different novel quantum phenomena in the same 2D superconducting system.

关键词： two-dimensional superconductor quantum phase transition quantum Griffiths singularity transition metal dichalcogenides electrical transport property

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Transforming information from spin encoding to route encoding

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chinese Optics Letters 2014年第7期12卷 60-62页

作者：刘爱萍熊霄任希锋郭光灿 Key Laboratory of quantum information University of Science and Technology of China synergetic innovation Center of quantum information & quantum physics University of Science and Technology of China

Spin （polarization） is widely used in free-space optics, while in photouic integrated circuits （PICs）, infor- mation is usually encoded in optical route. So a practical way to connect these two encoding methods is necessary for information communication. In this letter, an encoding convertor is designed to connect spin encoding and route encoding. Finite element method is used to calculate the conversion efficiency and extinction ratio of the encoding convertor and the theoretical analyses are also given. Our protocol shows a friendly way to convert optical spin information to route information, which will promote the compatibility of free-space optics and PICs.

关键词： Transforming information from spin encoding to route encoding exp THz

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Low-power-pumped high-efficiency frequency doubling at 397.5 nm in a ring cavity

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chinese Optics Letters 2014年第11期12卷 86-89页

作者：李岩周志远丁冬生史保森 Key Laboratory of quantum information University of Science and Technology of China synergetic innovation Center of quantum information & quantum physics University of Science and Technology of China

We report low pump power high-efficiency frequency doubling of a fundamental laser beam at 795 nm, corresponding to the rubidium D1 line, to generate UV light at 397.5 nm using a periodically poled KTi OPO4（PPKTP） crystal in a ring cavity. We obtain maximum stable output power of 49 m W for mode-matching pump power of 110 m W, corresponding to 45% raw efficiency（56% net efficiency when considering the output coupling mirror’s 80% transmission）. This is the highest efficiency obtained at this wavelength in PPKTP with such low pump power. We obtain 80% beam coupling efficiency to single-mode fiber, demonstrating high beam quality.

关键词： Frequency doublers Laser beams Pumping (laser) Single mode fibers

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Correction of the second-order degree of coherence measurement

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chinese Optics Letters 2016年第7期14卷 98-101页

作者：李聪丛陈向东李燊孙方稳 Key Laboratory of quantum information University of Science and Technology of China synergetic innovation Center of quantum information and quantum physics University of Science and Technology of China

The measurement of the second-order degree of coherence [g（2）（t）] is one of the important methods used to study the dynamical evolution of photon-matter interaction systems. Here, we use a nitrogen-vacancy center in a diamond to compare the measurement of g（2）（t） with two methods. One is the prototype measurement process with a tunable delay. The other is a start-stop process based on the time-to-amplitude conversion （TAC） and multichannel analyzer （MCA） system, which is usually applied to achieve efficient measurements. The divergence in the measurement results is observed when the delay time is comparable with the mean interval time between two neighboring detected photons. Moreover, a correction function is presented to correct the results from the TAC-MCA system to the genuine g（2）（t）. Such a correction method will provide a way to study the dynamics in photonic systems for quantum information techniques.

关键词： MCA Correction of the second-order degree of coherence measurement

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Multiuser-to-multiuser entanglement distribution based on 1550 nm polarization-entangled photons

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Science Bulletin 2015年第12期60卷 1128-1132,I0003页

作者： Dong-Yang Cao Key Laboratory of quantum information University of Scienceand Technology of China Chinese Academy of SciencesHefei 230026 China synergetic innovation Center of quantum information and quantum physics University of Science and Technology of China Hefei 230026 China

电信乐队纠缠极化的光子对来源广泛地由于它的可接受的传播损失在量通讯被使用了。构造纠纷分发者也与波长部门 multiplexing (WDM ) 在合作被使用。然而，以前的计划通常不对 multinode 情形合适。在这份报纸，我们构造一个电信乐队纠... 详细信息

电信乐队纠缠极化的光子对来源广泛地由于它的可接受的传播损失在量通讯被使用了。构造纠纷分发者也与波长部门 multiplexing (WDM ) 在合作被使用。然而，以前的计划通常不对 multinode 情形合适。在这份报纸，我们构造一个电信乐队纠缠极化的光子对来源，和它出现超离频两个都比 90 大的忠实和同时发生 ?%( 未加工的数据) 。而且，我们基于 WDM 建立了一个 four-by-four 纠纷经销商。我们检查 16 ClauserHorneShimonyHolt 不平等，它显示出 nonlocality。作为这来源的实际申请的一个例子，最后，我们估计当它在量钥匙分发被使用时，量位错误率和量秘密给率调音。而且，在长光的纤维的纠纷的传播也被表明。

关键词：纠缠光子对量子纠缠多用户偏振纳米量子密钥比特错误率传输损耗

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Generation of Nitrogen-Vacancy Center Pairs in Bulk Diamond by Molecular Nitrogen Implantation

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chinese physics Letters 2016年第2期33卷 75-78页

作者：贡赵军陈向东李聪丛李燊赵博文孙方稳 Key Laboratory of quantum information University of Science and Technology of China synergetic innovation Center of quantum information and quantum physics University of Science and Technology of China

The coupled negatively charged nitrogen-vacancy （NV-） center system is a promising candidate for scalable quantum information techniques. In this work, ionized nitrogen molecules are implanted into bulk diamond to generate coupled NV- center pairs. The two-photon autocorrelation measurement and optically detected magnetic resonance measurement are carried out to confirm the production of the NV- center pair. Also, both 1.3μs decoherence time and 4.g kHz magnetic coupling strength of the NV- center pair are measured by controlling and detecting the spin states. Along with nanoscale manipulation and detection methods, such coupled NV- centers through short distance dipole-dipole interaction would show high potential in scalable quantum information processes.

关键词： of is in by pair been

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Compton profile of molecular hydrogen

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chinese physics B 2015年第3期24卷 118-121页

作者：赵小利杨科徐龙泉马永朋闫帅倪冬冬康旭刘亚伟朱林繁 Hefei National Laboratory for Physical sciences at Microscale and Department of Modern physics University of Science and Technology of China synergetic innovation Center of quantum information and quantum physics University of Science and Technology of China Shanghai Institute of Applied physics Chinese Academy of Sciences

The Compton profile of molecular hydrogen has been determined at an incident photon energy of 20 ke V based on the third generation synchrotron radiation, and the statistical accuracy of 0.2% is achieved at p z = 0. Different theoretical methods, i.e., the density functional method, and the Hartree–Fock method, were used to calculate the Compton profiles of hydrogen with different basis sets, and the theoretical calculations are in agreement with the experimental observation in the whole p z region. Compared with the HF calculation, the DFT-B3 LYP ones are in better agreement with the present experiment, which indicates the electron correlation effect is very important to describe the wavefunction in the ground state of hydrogen.

关键词： Compton profile hydrogen molecule electron correlation

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Emergent superconducting fluctuations in compressed kagome superconductor CsV_(3)Sb_(5)

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Science Bulletin 2023年第3期68卷 259-265,M0003页

作者： Xikai Wen Fanghang Yu Zhigang Gui Yuqing Zhang Xingyuan Hou Lei Shan Tao Wu Ziji Xiang Zhenyu Wang Jianjun Ying Xianhui Chen Department of physics and CAS Key Laboratory of Strongly-coupled Quantum Matter PhysicsUniversity of Science and Technology of ChinaHefei 230026China CAS Center for excellence in quantum information and quantum physics Hefei 230026China information Materials and Intelligent Sensing Laboratory of Anhui Province Institutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Anhui UniversityHefei 230601China

The recent discovery of superconductivity(SC)and charge density wave(CDW)in kagome metals AV3Sb5(A=K,Rb,Cs)provides an ideal playground for the study of emergent electronic *** of moderate pressure leads to a two-dome-shaped SC phase regime in CsV_(3)Sb_(5) accompanied by the destabilizing of CDW ***,the nature of this pressure-tuned SC state and its interplay with the CDW are yet to be ***,we perform soft point-contact spectroscopy(SPCS)measurements in CsV_(3)Sb_(5) to investigate the evolution of superconducting order parameter with ***,we find that the superconducting gap is significantly enhanced between the two SC domes,at which the zero-resistance temperature is suppressed and the transition is remarkably ***,the temperature-dependence of the SC gap in this pressure range severely deviates from the conventional Bardeen-Cooper-Schrieffer(BCS)behavior,evidencing for strong Cooper pair phase *** findings reveal the complex intertwining of the CDW with SC in the compressed CsV_(3)Sb_(5),suggesting striking parallel to the cuprate superconductor La2*** results point to the essential role of charge degree of freedom in the development of intertwining electronic orders,and thus provide new constraints for theories.

关键词： Kagome superconductor Superconducting fluctuations Charge density wave

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Investigation of Compton Profile of Molecular Propane

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chinese physics Letters 2016年第9期33卷 32-34页

作者：梅小寻赵小利徐龙泉刘亚伟康旭闫帅倪冬冬杨科朱林繁 Hefei National Laboratory for Physical sciences at Microscale and Department of Modern physics University of Science and Technology of China synergetic innovation Center of quantum information and quantum physics University of Science and Technology of China Shanghai Institute of Applied physics Chinese Academy of Sciences

The experimental Compton profile of the propane molecule is measured at an incident photon energy of 20keY based on the third generation synchrotron radiation, and the statistical accuracy of 0.2% is achieved near pz = 0. The calculated Compton profile by the density functional theory with aug-cc-pVTZ basis set reproduces the experimental observation very well. The joint experimental and theoretical investigation provides the benchmark data of the electronic structure of propane.

关键词： of on as is been were with that in from for

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New family of Dirac and Weyl semimetals in XAuTe(X=Na, K,Rb) ternary honeycomb compounds

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Science China(physics,Mechanics & Astronomy) 2016年第10期59卷 66-71页

作者： Hao Sun Jin Zhao International Center for quantum Design of Functional Materials/Hefei National Laboratory for Physical sciences at Microscale and Key Laboratory of Strongly-Coupled quantum Matter physics Chinese Academy of Sciences and Department of Physics University of Science and Technology of China synergetic innovation Center of quantum information & quantum physics University of Science and Technology of China Department of physics and Astronomy University of Pittsburgh

We propose a new family of 3D Dirac semimetals based on XAuTe(X = K, Na, Rb) ternary honeycomb compounds, determined based on first-principles calculations, which are shown to be topological Dirac semimetals in which the Dirac points are induced by band inversion. Dirac points with four-fold degeneracy that are protected by C3 rotation symmetry and located on the Γ-A high-symmetry path are found. Through spatial-inversion symmetry breaking, a K(Au0.5 Hg0.5)(Te0.5As0.5) superlattice structure composed of KHgAs and KAuTe compounds is proven to be a Weyl semimetal with type-II Weyl points, which connect electronand hole-like bands. In this superlattice structure, the six pairs of Weyl nodes are distributed along the K-Γ high-symmetry path on the kz = 0 plane. Our research expands the family of topological Dirac and type-II Weyl semimetals.

关键词：狄拉克半金属化合物家庭 Na 蜂窝三元 Rb

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