检索结果-南通市图书馆

A trilayer process for the fabrication of Al phase qubits

在线全文

学校读者我要写书评

暂无评论

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

A piezoresistive-based 3-axial MEMS tactile sensor and integrated surgical forceps for gastrointestinal endoscopic minimally invasive surgery

在线全文

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2024年第5期10卷 71-83页

作者： Cheng Hou Huxin Gao Xiaoxiao Yang guangming xue Xiuli Zuo Yanqing Li Dongsheng Li Bo Lu Hongliang Ren Huicong Liu Lining Sun School of Mechanical and Electrical Engineering Jiangsu Provincial Key Laboratory of Advanced RoboticsSoochow UniversitySuzhouChina Faculty of Mechanical and Electrical Engineering Kunming University of Science and TechnologyJingming South RoadKunmingChina Yunnan Key Laboratory of Intelligent Control and Application KunmingChina Department of Electronic Engineering The Chinese University of Hong Kong(CUHK)Hong KongChina. Department of Gastroenterology Qilu HospitalShandong UniversityJinanShandongChina

In robotic-assisted surgery(RAS),traditional surgical instruments without sensing capability cannot perceive accurate operational forces during the task,and such drawbacks can be largely intensified when sophisticated tasks involving flexible and slender arms with small end-effectors,such as in gastrointestinal endoscopic surgery(GES).In this study,we propose a microelectromechanical system(MEMS)piezoresistive 3-axial tactile sensor for GES forceps,which can intuitively provide surgeons with online force feedback during robotic *** MEMS fabrication process facilitates sensor chips with miniaturized *** fully encapsulated tactile sensors can be effortlessly integrated into miniature GES forceps,which feature a slender diameter of just 3.5 mm and undergo meticulous calibration procedures via the least squares *** experiments,the sensor's ability to accurately measure directional forces up to 1.2 N in the Z axis was validated,demonstrating an average relative error of only 1.18%compared with the full-scale *** results indicate that this tactile sensor can provide effective 3-axial force sensing during surgical operations,such as grasping and pulling,and in ex vivo testing with a porcine *** compact size,high precision,and integrability of the sensor establish solid foundations for clinical application in the operating theater.

关键词： axial surgery intensified

Traveling-wave parametric amplifiere-induced qubit dephasing:analysis and mitigation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chip 2023年第4期2卷 97-104页

作者： Yingshan Zhang Huikai Xu Yu Song Yuqun Xu Shuang Yang Ziyue Hua Shoukuan Zhao Weiyang Liu guangming xue Yirong Jin Haifeng Yu Beijing Academy of Quantum Information Sciences Beijing 100193China Center for Quantum Information Institute for Interdisciplinary Information SciencesTsinghua UniversityBeijing 100084China Hefei National Laboratory Hefei 230088China

The mitigation of dephasing poses a significant challenge toimproving the performance of error-prone superconducting quantum computing ***,the dephasing of a transmon qubit ina dispersive readout regime was investigated by adopting aJosephson traveling-wave parametric amplifier as the *** findings reveal that the potent pump leakage from the preamplifier may lead to severe *** could be attributed to amixture of measurement-induced dephasing,ac Stark effect,*** is showed that pulse-mode readout is a promising measurement scheme to mitigate qubit dephasing while minimizing theneed for bulky *** work provides key insights intomitigating decoherence from microwave-pumped preamplifiers,which will be critical for advancing large-scale quantum computers.

关键词： TWPA Microwave pump Dephasing Pulse mode

Characterizing noise correlation and enhancing coherence via qubit motion

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fundamental Research 2021年第1期1卷 10-15页

作者： Jiaxiu Han Zhiyuan Li Jingning Zhang Huikai Xu Kehuan Linghu Yongchao Li Chengyao Li Mo Chen Zhen Yang Junhua Wang Teng Ma guangming xue Yirong Jin Haifeng Yu Beijing Academy of Quantum Information Sciences Beijing 100193China

The identification of spacial noise correlation is of critical importance in developing error-corrected quantum devices,but it has barely been studied so *** this work,we utilize an effective method called qubit motion,to efficiently determine the noise correlations between any pair of qubits in a 7-qubit superconducting quantum *** noise correlations between the same pairs of qubits are also investigated when the qubits are at distinct operating ***’s more,in this multi-qubit system with the presence of noise correlations,we demonstrate the enhancing effect of qubit motion on the coherence of logic qubits,and we propose a Motion-CPMG operation sequence to more efficiently protect the logic state from decoherence,which is experimentally demonstrated to extend the coherence time of logic qubits by nearly one order of magnitude.

关键词： Qubit motion Noise correlation Decoherence CPMG Quantum error correction

Realization of adiabatic and diabatic CZ gates in superconducting qubits coupled with a tunable coupler

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第4期30卷 81-85页

作者： Huikai Xu Weiyang Liu Zhiyuan Li Jiaxiu Han Jingning Zhang Kehuan Linghu Yongchao Li Mo Chen Zhen Yang Junhua Wang Teng Ma guangming xue Yirong Jin Haifeng Yu Beijing Academy of Quantum Information Sciences Beijing 100193China Shenzhen Insititute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China

High fidelity two-qubit gates are fundamental for scaling up the superconducting qubit *** use two qubits coupled via a frequency-tunable coupler which can adjust the coupling strength,and demonstrate the CZ gate using two different schemes,adiabatic and diabatic *** Clifford based randomized benchmarking(RB) method is used to assess and optimize the CZ gate *** fidelities of adiabatic and diabatic CZ gates are 99.53(8)% and 98.72(2)%,*** also analyze the errors induced by the *** to 30 ns duration time of adiabatic CZ gate,the duration time of diabatic CZ gate is 19 ns,revealing lower incoherence error rate r’_(incoherent),int=0.0197(5) compared to r_(incoherent,int)=0.0223(3).

关键词： controlled-Z gates high fidelity gates tunable coupler

带跳随机波动率模型的美式期权及美式障碍期权定价

在线全文

学校读者我要写书评

暂无评论

吉林大学学报（理学版） 2020年第5期58卷 1119-1129页

作者：薛广明林福宁广西财经学院信息与统计学院南宁530003

用两点G-J法和三点G-J法,在跳扩散随机波动率模型下对百慕大期权进行离散化处理,给出美式障碍期权和美式期权定价,并对其进行数值计算和结果分析.

关键词：跳扩散模型随机波动率 Girsanov测度变换障碍期权 Fourier反变换

在线全文

学校读者我要写书评

暂无评论

基于Bates模型的欧式离散障碍期权定价

华中师范大学学报（自然科学版） 2018年第2期52卷 164-171页

作者：薛广明邓国和广西财经学院信息与统计学院南宁530003 广西师范大学数学与统计学院广西桂林541004

在标的资产价格满足Bates模型下讨论离散时间情形的欧式障碍期权定价.应用半鞅It公式、随机过程在不同时间点上的多维联合特征函数、Girsanov测度变换以及Fourier反变换等随机分析方法,给出离散时间情形的欧式障碍期权价格的封闭式解... 详细信息

在标的资产价格满足Bates模型下讨论离散时间情形的欧式障碍期权定价.应用半鞅It公式、随机过程在不同时间点上的多维联合特征函数、Girsanov测度变换以及Fourier反变换等随机分析方法,给出离散时间情形的欧式障碍期权价格的封闭式解,并利用数值计算实例分析了波动率参数对障碍期权价格的影响.研究结论对连续时间情形的障碍期权定价或其他路径依赖型期权定价十分有借鉴作用.

关键词： Bates模型障碍期权 Fourier反变换数值实例

在线全文

学校读者我要写书评

暂无评论

弓张式超磁致伸缩材料换能器的设计与分析

强激光与粒子束 2016年第6期28卷 153-158页

作者：李冬伟杨朝舒薛光明军械工程学院车辆与电气工程系石家庄050003

为了提高超磁致伸缩换能器的作动行程,以获得足够大的发音强度,并使之满足发音装置体积小、装配零件少的要求,结合超磁致伸缩材料(GMM)的优良特性,提出一种基于三角放大原理的弓张式GMM换能器。该换能器以GMM棒作为驱动元件,通过固定弓... 详细信息

为了提高超磁致伸缩换能器的作动行程,以获得足够大的发音强度,并使之满足发音装置体积小、装配零件少的要求,结合超磁致伸缩材料(GMM)的优良特性,提出一种基于三角放大原理的弓张式GMM换能器。该换能器以GMM棒作为驱动元件,通过固定弓张结构的一端,将双向输出转变为单向输出,同时利用柔性铰链结构,进一步增大换能器的位移输出。通过分析换能器的工作原理,计算得到其理论放大倍数为2.73,与所建立的有限元仿真模型计算得到的放大倍数2.8相近。制作了试验样机并搭建了相应的试验系统,得到在1kHz范围内换能器最大输出位移为15.5μm,与仿真结果14.058μm相近。提出的弓张结构实现了换能器的位移放大,相应的分析方法也较好地反映了换能器的输出特性。

关键词：超磁致伸缩弓张结构位移输出比仿真试验

具有浮动执行价的远期生效幂亚式期权定价（英文）

在线全文

学校读者我要写书评

暂无评论

应用数学 2017年第4期30卷 916-926页

作者：薛广明邓国和广西财经学院信息与统计学院广西南宁530003 广西师范大学数学与统计学院广西桂林541004

本文研究具有浮动执行价的远期生效幂亚式期权的定价问题.利用鞅方法,首先推导出浮动执行价的远期生效幂亚式几何平均看涨期权价格的显示公式.随后,利用方差减少技术,以此幂亚式几何看涨期权价格公式作为控制变量建立浮动执行价的远期... 详细信息

本文研究具有浮动执行价的远期生效幂亚式期权的定价问题.利用鞅方法,首先推导出浮动执行价的远期生效幂亚式几何平均看涨期权价格的显示公式.随后,利用方差减少技术,以此幂亚式几何看涨期权价格公式作为控制变量建立浮动执行价的远期生效幂亚式算术平均看涨期权价格计算的蒙特卡罗模拟算法,获得浮动执行价的远期生效幂亚式期权的定价结果.最后,应用数值实例,分析模型主要参数,时间窗框和幂因子等因素异动时对该类期权价格的影响.计算结果,带控制变量的模拟方法能有效地解决幂亚式期权的定价,以及幂因子对期权价格的影响有显著性作用.

关键词：远期生效幂亚式期权蒙特卡罗模拟方差减少技术浮动执行价