期刊文献+

二次检索

题名
关键词
文摘
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到30篇文章
< 1 2 >
每页显示 20 50 100
Quantum speed limit time of a two-level atom under different quantum feedback control
1
作者 余敏 方卯发 邹红梅 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第1期253-257,共5页
We investigate the quantum speed limit time (QSLT) of a two-level atom under quantum-jump-based feedback control or homodyne-based feedback control. Our results show that the two different feedback control schemes h... We investigate the quantum speed limit time (QSLT) of a two-level atom under quantum-jump-based feedback control or homodyne-based feedback control. Our results show that the two different feedback control schemes have different influences on the evolutionary speed. By adjusting the feedback parameters, the quantum-jump-based feedback control can induce speedup of the atomic evolution from an excited state, but the homodyne-based feedback control cannot change the evolutionary speed. Additionally, the QSLT for the whole dynamical process is explored. Under the quantum-jump-based feedback control, the QSLT displays oscillatory behaviors, which implies multiple speed-up and speed-down processes during the evolution. While, the homodyne-based feedback control can accelerate the speed-up process and improve the uniform speed in the uniform evolution process. 展开更多
关键词 quantum speed limit time quantum feedback control SPEEDUP
下载PDF
Markov Quantum Feedback Control Based on Homodyne Measurement of a Two-Qubit System
2
作者 祝敬敏 王顺金 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第9期524-528,共5页
We consider the system consisting of two qubits collectively damped, with the output being unit-efficiency measured and subsequently fed back to control the system state. Our primary goal in this paper is (i) to sol... We consider the system consisting of two qubits collectively damped, with the output being unit-efficiency measured and subsequently fed back to control the system state. Our primary goal in this paper is (i) to solve the feedback-modified master equation, (ii) to demonstrate the ability of feedback control based on the solutions, and (iii) to pick out different steady states by choosing different driving strengths and feedback strengths to counteract the effects of both damping and the measurement back-action on the system. We further investigate some properties of the equilibrium steady state, its distribution probability and entanglement vs. the driving and feedback amplitudes. We find that in our feedback model feedback plays a negative role in producing entanglement. 展开更多
关键词 homodyne measurement Markov quantum feedback control NEGATIVITY
下载PDF
Influence of homodyne-based feedback control on the entropic uncertainty in open quantum system
3
作者 Juju Hu Qin Xue 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第7期137-143,共7页
For an open quantum system containing two qubits under homodyne-based feedback control, we investigate the dynamical behaviors of quantum-memory-assisted entropic uncertainty.Moreover, we analyze the influence of feed... For an open quantum system containing two qubits under homodyne-based feedback control, we investigate the dynamical behaviors of quantum-memory-assisted entropic uncertainty.Moreover, we analyze the influence of feedback modes and coefficients on the entropic uncertainty.Numerical investigations show that the memory qubit should be placed in a non-dissipative channel if the single dissipative channel condition can be chosen, which helps reduce the entropic uncertainty of the system.For the homodyne feedback control F =λσx(or F =λσy), due to different roles of the entangled qubits A and B, when they are subject to feedback control with different feedback coefficients λ, the exchange of feedback coefficients will cause variations of the entropic uncertainty.When the feedback coefficient corresponding to the memory qubit B is larger(λB >λA), the steady value of the entropic uncertainty will be small, which is conducive to enhancing the robustness of the system.However, for the feedback control F =λσz, the difference between the feedback coefficients has no effect on the steady values of the entropic uncertainty. 展开更多
关键词 homodyne-based feedback control quantum-memory-assisted entropic uncertainties MEMORY qubit open quantum system
下载PDF
Quantum Control Strategy Based on State Distance 被引量:10
4
作者 CONG Shuang KUANG Sen 《自动化学报》 EI CSCD 北大核心 2007年第1期28-31,共4页
Based on Bures distance, a Lyapunov function that represents the distance between a desired state and the actual state of a quantum system is selected. Considering the cases that an initial state is and is not orthogo... Based on Bures distance, a Lyapunov function that represents the distance between a desired state and the actual state of a quantum system is selected. Considering the cases that an initial state is and is not orthogonal to the desired state respectively, we propose a class of control strategies with state feedback that ensures the stability of the closed-loop control system. Especially, the asymptotic stability of the control system is analyzed, deduced and proved in detail. Finally, a simulation experiment on a spin-1/2 particle system is done and the relation between the system state evolution time and control value is analyzed with diffierent parameters . Research results have general theoretical meaning for control of quantum systems. 展开更多
关键词 量子论 反馈管理 稳定性 自动化
下载PDF
Dissipative preparation of a steady three-dimensional entangled state via quantum-jump-based feedback 被引量:1
5
作者 陈丽 王洪福 张寿 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第3期104-108,共5页
A robust and scalable scheme to generate a steady three-dimensional entangled state for a V-type atom and a A- type atom trapped in a strongly dissipative bimodal cavity is proposed by direct feedback control based on... A robust and scalable scheme to generate a steady three-dimensional entangled state for a V-type atom and a A- type atom trapped in a strongly dissipative bimodal cavity is proposed by direct feedback control based on quantum-jump detection. The robustness of this scheme reflects in the insensitivity to detection inefficiencies and the strong ability against the parameter fluctuations in the feedback, driving, and coupling strengths. The influence of atomic spontaneous emission can be suppressed by using the local feedback control. The scalability is ensured that N-dimensional entangled states of two atoms can be deterministically generated. 展开更多
关键词 three-dimensional entangled state quantum jump feedback control
下载PDF
Quantum State Preparation and Protection by Measurement-Based Feedback Control Against Decoherence 被引量:1
6
作者 闫妍 邹健 +3 位作者 王璐 徐宝明 王朝全 邵彬 《Communications in Theoretical Physics》 SCIE CAS CSCD 2015年第2期149-158,共10页
We consider an open quantum system subjected to a noise channel under measurement-based feedback control and two prototypical classes of decoherence channels are considered: phase damping and generalized amplitude da... We consider an open quantum system subjected to a noise channel under measurement-based feedback control and two prototypical classes of decoherence channels are considered: phase damping and generalized amplitude damping. Based on quantum trajectory theory, we obtain an extended master equation for the dynamics of the reduced system in the presence of feedback control. For a qubit system we analytically solve this master equation and obtain the solution of the state vector dynamics. Then we propose an effective feedback control scheme for preparing an arbitrary quantum pure state. We also study how to protect two nonorthogonai states effectively, and find that projective measurement with unbiazed basis is not optimal for this task, while weak measurement with biased basis could realize the best protection of two nonorthogonal states. Furthermore, the inefficiencies in the feedback process are also discussed 展开更多
关键词 quantum feedback control weak measurement state preparation state protection
原文传递
n比特随机量子系统实时状态估计及其反馈控制 被引量:1
7
作者 张骄阳 丛爽 匡森 《自动化学报》 EI CAS CSCD 北大核心 2024年第1期42-53,共12页
研究了n比特随机量子系统实时状态估计及其反馈控制的问题.对于连续弱测量(Continuous weak measurement, CWM)过程存在高斯噪声的情况,基于在线交替方向乘子法(Online alternating direction multiplier method,OADM)推导出一种适用于... 研究了n比特随机量子系统实时状态估计及其反馈控制的问题.对于连续弱测量(Continuous weak measurement, CWM)过程存在高斯噪声的情况,基于在线交替方向乘子法(Online alternating direction multiplier method,OADM)推导出一种适用于n比特随机量子系统的实时量子状态估计算法,即QSE-OADM (Quantum state estimation based on OADM).运用李雅普诺夫方法设计控制律,实现基于实时量子状态估计的反馈控制,并证明所提控制律的收敛性.以2比特随机量子系统为例进行数值仿真实验,通过与基于QST-OADM (Quantum state tomography based on OADM)算法和OPG-ADMM (Online proximal gradient-based alternating direction method of multipliers)算法的量子反馈控制方案的性能对比,验证了所提控制方案的优越性. 展开更多
关键词 随机量子系统 量子反馈控制 在线交替方向乘子法 李雅普诺夫控制方法
下载PDF
Real-Time Optimal State Estimation-Based Feedback Control for Stochastic Quantum Systems in the Non-Markovian Case
8
作者 CONG Shuang ZHANG Jiaoyang +1 位作者 KUANG Sen HARRAZ Sajede 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2023年第6期2274-2291,共18页
This paper studies the real-time optimal state estimation-based feedback control for twolevel stochastic quantum systems in the non-Markovian case.The system model is established by combining the time-convolutionless ... This paper studies the real-time optimal state estimation-based feedback control for twolevel stochastic quantum systems in the non-Markovian case.The system model is established by combining the time-convolutionless non-Markovian master equation and the stochastic master equation.A nonlinear filter based on the state-dependent Riccati equation is designed in order to achieve the realtime optimal estimation of quantum states.A quadratic function multiplied with an exponential term is selected as the Lyapunov function,and a continuous-time control law is deduced via the stochastic Lyapunov stability theorem to realize eigenstate feedback control based on real-time optimal state estimation.Numerical simulation results illustrate that the proposed control scheme is capable of steering the two-level quantum system from an arbitrary initial state to the desired eigenstate with a fidelity higher than 99%within a time of 3 a.u. 展开更多
关键词 Lyapunov-based approach optimal nonlinear filter quantum feedback control stochastic quantum system
原文传递
Quantum feedback networks and control:A brief survey 被引量:3
9
作者 JAMES Matthew R 《Chinese Science Bulletin》 SCIE EI CAS 2012年第18期2200-2214,共15页
The purpose of this paper is to provide a brief review of some recent developments in quantum feedback networks and control.A quantum feedback network (QFN) is an interconnected system consisting of open quantum syste... The purpose of this paper is to provide a brief review of some recent developments in quantum feedback networks and control.A quantum feedback network (QFN) is an interconnected system consisting of open quantum systems linked by free fields and/or direct physical couplings.Basic network constructs,including series connections as well as feedback loops,are discussed.The quantum feedback network theory provides a natural framework for analysis and design.Basic properties such as dissipation,stability,passivity and gain of open quantum systems are discussed.Control system design is also discussed,primarily in the context of open linear quantum stochastic systems.The issue of physical realizability is discussed,and explicit criteria for stability,positive real lemma,and bounded real lemma are presented.Finally for linear quantum systems,coherent H∞ and LQG control are described. 展开更多
关键词 开放量子系统 反馈网络 控制系统 有界实引理 LQG控制 网络结构 反馈回路 网络理论
原文传递
Feedback stabilization of N-dimensional stochastic quantum systems based on bang-bang control 被引量:1
10
作者 Xiaqing SUN Sen KUANG +2 位作者 Yanan LIU Juan ZHOU Shuang CONG 《Control Theory and Technology》 EI CSCD 2017年第3期206-218,共13页
For an N-dimensional quantum system under the influence of continuous measurement, this paper presents a switching control scheme where the control law is of bang-bang type and achieves asymptotic preparation of an ar... For an N-dimensional quantum system under the influence of continuous measurement, this paper presents a switching control scheme where the control law is of bang-bang type and achieves asymptotic preparation of an arbitrarily given eigenstate of a non-degenerate and degenerate measurement operator, respectively. In the switching control strategy, we divide the state space into two parts: a set containing a target state, and its complementary set. By analyzing the stability of the stochastic system model under consideration, we design a constant control law and give some conditions that the control Hamiltonian satisfies so that the system trajectories in the complementary set converge to the set which contains the target state. Further, for the case of a non-degenerate measurement operator, we show that the system trajectories in the set containing the target state will automatically converge to the target state via quantum continuous measurement theory; while for the case of a degenerate measurement operator, the corresponding system trajectories will also converge to the target state via the construction of the control Hamiltonians. The convergence of the whole closed-loop systems under the cases of a non-degenerate and a degenerate measurement operator is strictly proved. The effectiveness of the proposed switching control scheme is verified by the simulation experiments on a finite-dimensional angular momentum system and a two-qubit system. 展开更多
关键词 quantum systems feedback stabilization bang-bang control switching strategy
原文传递
量子系统控制发展综述 被引量:17
11
作者 丛爽 郑毅松 +1 位作者 姬北辰 戴谊 《量子电子学报》 CAS CSCD 北大核心 2003年第1期1-9,共9页
详细论述了量子系统控制理论从提出到现在近二十年的发展过程。首先介绍了量子系统可控性的研究及其进展,并简要分析了简单量子系统的开环控制方法,然后把重点放在学习控制和反馈控制等几种典型闭环控制方法的讨论上,分析了它们各自的... 详细论述了量子系统控制理论从提出到现在近二十年的发展过程。首先介绍了量子系统可控性的研究及其进展,并简要分析了简单量子系统的开环控制方法,然后把重点放在学习控制和反馈控制等几种典型闭环控制方法的讨论上,分析了它们各自的优缺点,并根据量子控制的发展趋势,对其应用和发展前景进行了预测,从整体上系统地描述了建立一套完整的量子控制系统所需要的五个基本步骤,最后在此基础上提出了制约量子系统控制发展的几个关键性问题。 展开更多
关键词 量子控制 控制系统 反馈控制 学习控制 量子系统
下载PDF
基于相干控制的二能级量子系统退相干抑制 被引量:4
12
作者 张靖 李春文 《控制与决策》 EI CSCD 北大核心 2006年第5期508-512,共5页
对于二能级开放量子系统,研究了利用相干控制抑制退相干效应的问题.首先讨论了二能级开放量子系统在相干控制下的建模问题,将退相干抑制归结为与环境噪声解耦的控制问题.然后,引入开环控制抑制退相干,并证明该控制可使系统状态中的部分... 对于二能级开放量子系统,研究了利用相干控制抑制退相干效应的问题.首先讨论了二能级开放量子系统在相干控制下的建模问题,将退相干抑制归结为与环境噪声解耦的控制问题.然后,引入开环控制抑制退相干,并证明该控制可使系统状态中的部分分量与环境噪声渐近解耦.最后引入反馈控制,使得系统状态的相应分量可以与环境精确解耦,同时能够避免测量引入的量子噪声的影响. 展开更多
关键词 量子控制 退相干控制 量子反馈控制
下载PDF
Quantum control of bosonic modes with superconducting circuits 被引量:2
13
作者 Wen-Long Ma Shruti Puri +3 位作者 Robert J.Schoelkopf Michel H.Devoret SMGirvin Liang Jiang 《Science Bulletin》 SCIE EI CSCD 2021年第17期1789-1805,M0004,共18页
Bosonic modes have wide applications in various quantum technologies,such as optical photons for quantum communication,magnons in spin ensembles for quantum information storage and mechanical modes for reversible micr... Bosonic modes have wide applications in various quantum technologies,such as optical photons for quantum communication,magnons in spin ensembles for quantum information storage and mechanical modes for reversible microwave-to-optical quantum transduction.There is emerging interest in utilizing bosonic modes for quantum information processing,with circuit quantum electrodynamics(circuit QED)as one of the leading architectures.Quantum information can be encoded into subspaces of a bosonic superconducting cavity mode with long coherence time.However,standard Gaussian operations(e.g.,beam splitting and two-mode squeezing)are insufficient for universal quantum computing.The major challenge is to introduce additional nonlinear control beyond Gaussian operations without adding significant bosonic loss or decoherence.Here we review recent advances in universal control of a single bosonic code with superconducting circuits,including unitary control,quantum feedback control,drivendissipative control and holonomic dissipative control.Various approaches to entangling different bosonic modes are also discussed. 展开更多
关键词 Bosonic modes Circuit QED Unitary dynamics quantum feedback control Driven-dissipative processes Holonomic quantum computation
原文传递
随机开放量子系统模型及其反馈控制的特性分析 被引量:1
14
作者 丛爽 薛静静 《量子电子学报》 CAS CSCD 北大核心 2015年第2期186-197,共12页
研究了不同情况下基于连续测量的随机开放量子系统模型。对于受到测量影响的不同开放量子系统模型,分析了模型建立的条件、模型的组成及其影响;对于所简化的模型,分析了其简化的过程;同时对不同模型之间的关系进行对比分析。基于估计状... 研究了不同情况下基于连续测量的随机开放量子系统模型。对于受到测量影响的不同开放量子系统模型,分析了模型建立的条件、模型的组成及其影响;对于所简化的模型,分析了其简化的过程;同时对不同模型之间的关系进行对比分析。基于估计状态的随机开放量子系统的反馈控制,分别对目前已有的开关控制和连续性控制在本征态之间状态转移的控制思想、所具有的特性、控制效果、适用条件、改进过程等进行了对比研究。同时还探讨了环境退相干和时间延迟影响下反馈控制器的设计。 展开更多
关键词 量子控制 随机开放量子系统模型 量子连续测量 量子滤波器 量子反馈控制
下载PDF
二溴甲烷相干反斯托克斯拉曼光谱的选择激发增强研究 被引量:3
15
作者 张亮 李霞 +5 位作者 张诗按 张向韵 邓莉 陈果良 孙真荣 王祖赓 《量子电子学报》 CAS CSCD 北大核心 2007年第6期694-698,共5页
采用基于遗传算法(Genetic algorithm)的自适应反馈系统,成功实现了二溴甲烷多个拉曼振动模式的选择激发.通过脉冲分析方法(二次谐波频率分辨光谱开关和二次谐波交叉频率分辨光谱开关)(SHG-FROG和SHG-XFROG),在时域和频域上对优化脉冲... 采用基于遗传算法(Genetic algorithm)的自适应反馈系统,成功实现了二溴甲烷多个拉曼振动模式的选择激发.通过脉冲分析方法(二次谐波频率分辨光谱开关和二次谐波交叉频率分辨光谱开关)(SHG-FROG和SHG-XFROG),在时域和频域上对优化脉冲进行还原和分析,结果表明:空间光学调制器(SLM)将优化脉冲调制成具有负啾啁特性的脉冲串。该选择激发实验的成功实现验证了相干控制自适应系统在研究复杂分子系统方面具有良好的应用前景。 展开更多
关键词 量子光学 选择增强 自适应反馈控制 相干反斯托克斯拉曼光谱
下载PDF
量子反馈控制研究进展
16
作者 董道毅 陈宗海 《量子电子学报》 CAS CSCD 北大核心 2005年第6期833-839,共7页
量子反馈控制理论将反馈的思想引入量子系统的主动控制中,已开始在量子光学、原子物理和量子 信息学等领域发挥越来越重要的作用。考虑到各种反馈策略的差异性,综述了量子反馈控制理论的研究进展, 分析和阐述了马尔可夫量子反馈、贝叶... 量子反馈控制理论将反馈的思想引入量子系统的主动控制中,已开始在量子光学、原子物理和量子 信息学等领域发挥越来越重要的作用。考虑到各种反馈策略的差异性,综述了量子反馈控制理论的研究进展, 分析和阐述了马尔可夫量子反馈、贝叶斯量子反馈、含时延非马尔可夫量子反馈和相干量子反馈,并对四种量 子反馈策略进行了简单比较。 展开更多
关键词 量子控制 量子反馈控制 马尔可夫量子反馈 贝叶斯量子反馈 相干量子反馈
下载PDF
量子力学系统控制的基础及现状 被引量:1
17
作者 丛爽 郑毅松 《自动化博览》 2003年第1期41-44,共4页
通过对微观量子领域及宏观领域的分析,分别对量子力学系统与经典力学之间的对应关系进行了阐述,并对国际上现有的反馈控制及学习控制进行了介绍并对各自的优缺点进行了分析,在此基础上对量子控制理论的发展前景进行了展望。
关键词 量子论 宏观物质 微观粒子 量子Hall效应 量子力学系统 反馈控制 学习控制 量子态
下载PDF
量子控制 被引量:1
18
作者 干耀国 金荧荧 《甘肃联合大学学报(自然科学版)》 2008年第2期45-47,共3页
给出量子控制的概念、理论及未来可能的应用.人类长期希望控制物质微观的量子状态,特别是波函数的控制.目前量子控制的主要进展是利用脉冲激光"整形"来控制光与物质的相互作用、控制原子分子的微观态,从而控制化学反应或量子... 给出量子控制的概念、理论及未来可能的应用.人类长期希望控制物质微观的量子状态,特别是波函数的控制.目前量子控制的主要进展是利用脉冲激光"整形"来控制光与物质的相互作用、控制原子分子的微观态,从而控制化学反应或量子跃迁的概率. 展开更多
关键词 量子控制 量子态 波函数 反馈控制
下载PDF
量子密钥分配系统中非线性偏振耦合的研究
19
作者 董颖娣 彭进业 《激光技术》 CAS CSCD 北大核心 2015年第6期756-760,共5页
受传输光纤非线性偏振影响,量子密钥分配系统本振光与信号光耦合率下降,使形成偏振复用信号的抖动增强,系统的稳定性和安全性下降。为了提高量子光学中偏振编码技术的性能,经过理论分析和数值模拟,给出可操作性的实验方案,解决了光纤非... 受传输光纤非线性偏振影响,量子密钥分配系统本振光与信号光耦合率下降,使形成偏振复用信号的抖动增强,系统的稳定性和安全性下降。为了提高量子光学中偏振编码技术的性能,经过理论分析和数值模拟,给出可操作性的实验方案,解决了光纤非线性偏振耦合导致的偏振抖动问题。结果表明,在同等条件下,以分光检测结果反馈控制本振光和信号光的非线性偏振耦合率,可增强偏振复用信号的稳定性,将系统传输容量提高61%。该结果有利于偏振编码技术在量子密钥分配系统的实际应用。 展开更多
关键词 量子光学 量子密钥分配 反馈控制 偏振编码 非线性偏振 偏振抖动
下载PDF
基于广义卡尔曼-布西滤波的压缩光相位自适应估计方法 被引量:1
20
作者 陈树新 徐涵 +3 位作者 吴昊 房亮 崔军辉 钟慧 《北京理工大学学报》 EI CAS CSCD 北大核心 2020年第6期661-666,686,共7页
应用量子理论获取导航测角中的相位参数,有望获取超越经典理论极限的定位精度.在利用量子零拍探测测量相位压缩光的相位时,本振相位与待测相位在正交的前提下得到的零拍电流受到散粒噪声的影响最小.为了保证本振相位能够时刻满足此条件... 应用量子理论获取导航测角中的相位参数,有望获取超越经典理论极限的定位精度.在利用量子零拍探测测量相位压缩光的相位时,本振相位与待测相位在正交的前提下得到的零拍电流受到散粒噪声的影响最小.为了保证本振相位能够时刻满足此条件,并考虑到导航系统非线性和实时性的特点,基于广义卡尔曼-布西滤波设计了零拍锁相环,对本振相位进行实时的反馈控制,进而实现对压缩光相位的实时估计.理论分析以及仿真结果表明,利用压缩光作为信号场获取相位参数时能够突破散粒噪声的限制,提高导航测角系统的定位精度,并且在最优压缩度处相位估计精度最高,最优压缩度取决于压缩光强度以及测量系统的相位稳定性. 展开更多
关键词 量子参数估计 压缩光 广义卡尔曼-布西滤波 反馈控制 锁相环
下载PDF
上一页 1 2 下一页 到第
使用帮助 返回顶部