首站-论文投稿智能助手
典型文献
Quantum speed limit for mixed states in a unitary system
文献摘要:
Since the evolution of a mixed state in a unitary system is equivalent to the joint evolution of the eigenvectors contained in it,we could use the tool of instantaneous angular velocity for pure states to study the quantum speed limit(QSL)of a mixed state.We derive a lower bound for the evolution time of a mixed state to a target state in a unitary system,which automatically reduces to the quantum speed limit induced by the Fubini-Study metric for pure states.The computation of the QSL of a degenerate mixed state is more complicated than that of a non-degenerate mixed state,where we have to make a singular value decomposition(SVD)on the inner product between the two eigenvector matrices of the initial and target states.By combing these results,a lower bound for the evolution time of a general mixed state is presented.In order to compare the tightness among the lower bound proposed here and lower bounds reported in the references,two examples in a single-qubit system and in a single-qutrit system are studied analytically and numerically,respectively.All conclusions derived in this work are independent of the eigenvalues of the mixed state,which is in accord with the evolution properties of a quantum unitary system.
文献关键词:
作者姓名:
Jie-Hui Huang;Li-Guo Qin;Guang-Long Chen;Li-Yun Hu;Fu-Yao Liu
作者机构:
School of Mathematics,Physics and Statistics,Shanghai University of Engineering Science,Shanghai 201620,China;College of Physics and Communication Electronics,Jiangxi Normal University,Nanchang 330022,China
引用格式:
[1]Jie-Hui Huang;Li-Guo Qin;Guang-Long Chen;Li-Yun Hu;Fu-Yao Liu-.Quantum speed limit for mixed states in a unitary system)[J].中国物理B(英文版),2022(11):265-272
A类:
B类:
Quantum,speed,limit,mixed,states,unitary,system,Since,evolution,equivalent,joint,eigenvectors,contained,could,use,tool,instantaneous,angular,velocity,pure,study,quantum,QSL,We,lower,target,which,automatically,reduces,induced,by,Fubini,Study,metric,computation,degenerate,more,complicated,than,that,where,have,make,singular,decomposition,SVD,inner,product,between,two,matrices,initial,By,combing,these,results,general,presented,In,order,compare,tightness,among,proposed,bounds,reported,references,examples,single,qubit,qutrit,studied,analytically,numerically,respectively,All,conclusions,derived,this,work,independent,eigenvalues,accord,properties
AB值:
0.505042
相似文献
On-chip beam rotators,adiabatic mode converters,and waveplates through low-loss waveguides with variable cross-sections
Bangshan Sun;Fyodor Morozko;Patrick S.Salter;Simon Moser;Zhikai Pong;Raj B.Patel;Ian A.Walmsley;Mohan Wang;Adir Hazan;Nicolas Barré;Alexander Jesacher;Julian Fells;Chao He;Aviad Katiyi;Zhen-Nan Tian;Alina Karabchevsky;Martin J.Booth-Department of Engineering Science,University of Oxford,Oxford OX1 3PJ,UK;School of Electrical and Computer Engineering,Ben-Gurion University of the Negev,P.O.B.653,Beer-Sheva 8410501,Israel;Institute of Biomedical Physics,Medical University of Innsbruck,Müllerstra?e 44,6020 Innsbruck,Austria;Ultrafast Quantum Optics group,Department of Physics,Imperial College London,London,UK;Department of Physics,University of Oxford,Oxford,UK;Erlangen Graduate School in Advanced Optical Technologies(SAOT),Friedrich-Alexander-University Erlangen-Nurnberg,Paul-Gordan-Stra?e 6,91052 Erlangen,Germany;State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun 130012,China
Quantitative analysis and time-resolved characterization of simulated tokamak exhaust gas by laser-induced breakdown spectroscopy
Yaxiong HE;Tao XU;Yong ZHANG;Chuan KE;Yong ZHAO;Shu LIU-School of Physics and Energy,Fujian Normal University,Fuzhou 350117,People's Republic of China;Center for Superconducting and New Energy Research and Development,Southwest Jiaotong University,Chengdu 610031,People's Republic of China;Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering,Fuzhou 350117,People's Republic of China;Shandong Dong Yi Optoelectronic Instrument Co.,Ltd,Yantai 264670,People's Republic of China;Technical Center for Industrial Product and Raw Material Inspection and Testing,Shanghai Customs,Shanghai 200135,People's Republic of China
机标中图分类号,由域田数据科技根据网络公开资料自动分析生成,仅供学习研究参考。