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Solid-state quantum computation station

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Chinese Physics B 2018年第7期27卷 1-7页

作者： Fanming Qu Zhongqing Ji Ye Tian shiping zhao Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Solid-state quantum computation station belongs to the group 2 of manipulation of quantum state in the Synergetic Extreme Condition User Facility. Here we will first outline the research background, aspects, and objectives of the station, followed by a discussion of the recent scientific as well as technological progress in this field based on similar experimental facilities to be constructed in the station. Finally, a brief summary and research perspective will be presented.

关键词： Quantum computation superconducting qubit topological quantum state Majorana fermion

Fabrication and characterization of superconducting multiqubit device with niobium base layer

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Chinese Physics B 2021年第10期30卷 138-142页

作者： Feifan Su zhaohua Yang Shoukuan zhao Haisheng Yan Ziting Wang Xiaohui Song Ye Tian shiping zhao Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Chinese Academy of Sciences Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

Superconducting transmon qubits are the leading platform in solid-state quantum computing and quantum simulation *** this work,we develop a fabrication process for the transmon multiqubit device with a niobium base layer,shadow-evaporated Josephson junctions,and airbridges across the qubit control lines to suppress *** results show that these multiqubit devices have well-characterized readout resonators,and that the energy relaxation and Ramsey(spin-echo)dephasing times are up to∼40µs and 14(47)µs,*** perform single-qubit gate operations that demonstrate a maximum gate fidelity of 99.97%.In addition,two-qubit vacuum Rabi oscillations are measured to evaluate the coupling strength between qubits,and the crosstalk among qubits is found to be less than 1%with the fabricated *** improvements in qubit coherence performance using this fabrication process are also discussed.

关键词： superconducting quantum computing transmon qubit device fabrication characterization

A trilayer process for the fabrication of Al phase qubits

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Science China(Physics,Mechanics & Astronomy) 2013年第12期56卷 2377-2380页

作者： XUE GuangMing YU HaiFeng TIAN Ye DENG Hui LIU WeiYang REN YuFeng YU HongWei ZHENG DongNing zhao shiping Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences

Herein we develop an Al/AlOx/Al trilayer process, feasible to fabricate complex circuits with wiring crossovers, for the preparation of A1 junctions and phase qubits. The AlOx layer is obtained by in situ thermal oxidation, which provides high-quality junction tunnel barriers. The A1 junctions show a considerably low leakage current and the Josephson critical current density can be conveniently controlled in the range of a few to above 100 A/cm2, which is favorable in the phase qubit application. Macroscopic quantum tunneling, energy spectrum, energy relaxation time, Rabi oscillation, and Ramsey interference of the A1 phase qubits are measured, demonstrating clearly quantum coherent dynamics with a timescale of 10 ns. Further improvements of the coherent dynamic properties of the device are discussed.

关键词： Josephson junction trilayer process superconducting qubit

JOSEPHSON EFFECTS IN Nb/YBa_(2)Cu_(3)O_(7-δ) POINT CONTACTS AND YBa_(2)Cu_(3)O_(7-δ) BREAK JUNCTIONS

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Chinese Physics Letters 1988年第6期5卷 249-252页

作者： zhao shiping TAO Hongjie CHEN Yingfei YANG Qiansheng LIAO Qide A Shao XU Xiaozhen Institute of Physics Academia SinicaBeijing Department of Physics Central In stitute of NationalitiesBeijing

Josephson effects have been observed in Nb/YBa_(2)Cu_(3)O_(7-δ) point contacts and YBa_(2)Cu_(3)O_(7-δ) break *** the junctions are exposed to a microwave field,the I-V characteristics show constant voltage steps,the heights of which follow the Bessel function *** asymmetry about zero bias has been observed in YBCO break junctions which,we suggest,may possibly result from flux trapping in the complicated weak link structure of the ***-induced sub-steps have also been found in YBCO break *** experiments were conducted at liquid helium temperature.

关键词： temperature behavior steps

Effects of sea temperature of thermoclinic layer in equatorial warm pool on the low-latitude atmospheric general circulation

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海洋学报(英文版) 1988年第S1期 117-123页

作者： Wang shiping, zhao Hanguang and Wang Muzhen NMC, State Meteorological Administration, Beijing, China

By using the deep layer sea temperature data in the cross section of 137°E in the Western Pacific from 34°N to 1°S, and 500 hPa monthly mean geopotential height charts, the distribution structure and annual variation of ihe sea temperature at deep layer were analysed. It was found that the relation is out of phase between the annual variation of sea temperature at the thermoclinic layer (taken4°-8°N,and 75-200m in depth in Equatorial Western Pacific) and the current amount of equatorial anti-current. During the periods of the El Nino years, the equatorial anti-currents (from east to west) were enhanced, while the temperature of the thermoclinic layer in Equatorial Warm Pool (EWP) were decreased. When the El Nino events ended, the current amount of the equatorial anti-current would decrease rapidly, meanwhile, the sea temperature of the thermoclinic layer increased. On this basis, the effects of sea temperature of thermoclinic layer of EWP on the low-latitude atmospheric general circulation were stu

关键词： equatorial latitude currents ENSO charts evident analysed tropical eastern season

高速旋转射弹波浪入水多相流场与弹道特征数值仿真研究

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振动与冲击 2022年第8期41卷 55-71页

作者：李治涛赵世平卢丙举于勇中国船舶集团有限公司第七一三研究所郑州450015 河南省水下智能装备重点实验室郑州450015 北京理工大学宇航学院北京100081

基于重叠网格技术与6自由度算法对某一高速旋转射弹波浪中入水过程进行了数值模拟研究,分析了波峰、波节1、波谷、波节2等波面不同位置入水弹体空泡形态、弹道特征及流体动力载荷特性变化规律。研究结果表明:四种工况弹体均经历撞水、... 详细信息

基于重叠网格技术与6自由度算法对某一高速旋转射弹波浪中入水过程进行了数值模拟研究,分析了波峰、波节1、波谷、波节2等波面不同位置入水弹体空泡形态、弹道特征及流体动力载荷特性变化规律。研究结果表明:四种工况弹体均经历撞水、空泡形成、超空泡航行与沾湿,其中波节2弹体尾部最先与空泡壁面碰撞产生沾湿,波节1发生尾部沾湿最晚;四种工况弹体质心运动轨迹均产生了不同程度的偏转,仿真结束时侧向位移量、速度变化量由大到小工况依次为波节2、波峰、波谷和波节1;四种工况入水初期弹体在空泡中航行受到的力和力矩系数量级均较小,入水后期弹体表面大面积沾湿不同工况下的力和力矩系数有较大差别;四种工况弹体名义入水角相同均为25°,由于波面的存在弹体实际有效入水角发生了变化,它们由小到大工况依次为波节2、波峰、波谷和波节1,其值依次为10.3094°,25.0032°,25.0098°和39.6620°。

关键词：高速旋转射弹波浪入水重叠网格定义输入边界造波法

A high-Tc dc-SQUID-based single-channel MCG and its performance

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Chinese Science Bulletin 2002年第22期47卷 1861-1863,1937页

作者： WANG Huiwu DING Hongsheng ZHANG Lihua HUANG Xuguang CHEN Weichang WANG Ziqiang FENG Ji LIU Yiping zhao shiping REN Yufeng YU Hongwei XU Fengzhi WANG Xiaoyin CHEN Genghua YANG Qiansheng Institute of Physics Chinese Academy of SciencesBeijing 100080China China Japan Friendship Institute of Medical Sciences Beijing 100029China

A single-channel high-Tc dc-SQUID magnetometer and gradiometer have been developed to record the magnetic field component perpendicular to the human chest generated by heart-beat. Magnetocardiogram (MCG) measurements have been carried out inside a magnetically shielded room. By sequentially adjusting a non-magnetic patient table with 5 cm pitch in X and Y directions, the field signals on a rectangle grid 5×5 over the chest area were registered in real time trace point by point with a typical dwell time over 30 cardiocycles each. Utilizing standard electrocardiogram (ECG) recordings as timing reference measured simultaneously with the MCG signals, the MCG data were then averaged and combined to form magnetic field patterns every 10 ms or so. Both the current dipole, which is parallel to MCG measuring plane and produces the vertical magnetic field, and its depth were determined as a function of time in a standard way. We have compared the MCG of healthy hearts with that of a heart with right bundle

关键词： high-Tc dc-SQUID magnetocardiogram QRS complex.

Low-noise compact fiber laser based on nonlinear polarization evolution in an all-polarization-maintaining figure-8 cavity

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Chinese Optics Letters 2024年第7期22卷 47-52页

作者： Lian Zhou Daping Luo Gehui Xie shiping Xiong Haipeng Lou Zilin zhao Yuanfeng Di Chenglin Gu Wenxue Li State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China

We demonstrate an all-polarization-maintaining(APM)fiber mode-locked laser based on nonlinear polarization evolution(NPE).A well-designed Sagnac fiber loop is employed to establish the nonlinear polarization evolution process in a polarization beam splitter(PBS)figure-8 fiber *** loss curves are calculated to verify the saturable absorption characteristic of this NPE-based APM ***,we simulate the pulse propagation process in the cavity to demonstrate the pulse mode-locked ***,we also design a realizable compact scheme to further reduce noise disturbances,achieving a 101-fs mode-locked pulse train with a 0.3-mrad integrated phase noise and a 0.006%integrated relative intensity noise(RIN).This figure-8 fiber laser provides a new scheme for compacting low-noise compact APM fiber lasers based on the NPE mode-locked mechanism.

关键词： ultrafast laser fiber laser polarization-maintaining

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远程教育质量控制的思考

中国远程教育 2005年第8S期 21-22页

作者：赵世平戎锦北京科技大学管庄校区

我国远程教育事业发展十分迅速,但对远程教育质量问题存有许多争议。本文认为,要构建远程教育的质量控制体系,就必须树立发展和全面的质量观,要区分过程导向和内容导向这两种自主学习形式,并将两者有机的结合起来。

关键词：远程教育质量观质量控制