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Improved quantum bacterial foraging algorithm for tuning parameters of fractional-order PID controller 被引量:8
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作者 LIU Lu SHAN Liang +2 位作者 DAI Yuewei LIU Chenglin QI Zhidong 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2018年第1期166-175,共10页
The quantum bacterial foraging optimization(QBFO)algorithm has the characteristics of strong robustness and global searching ability. In the classical QBFO algorithm, the rotation angle updated by the rotation gate is... The quantum bacterial foraging optimization(QBFO)algorithm has the characteristics of strong robustness and global searching ability. In the classical QBFO algorithm, the rotation angle updated by the rotation gate is discrete and constant,which cannot affect the situation of the solution space and limit the diversity of bacterial population. In this paper, an improved QBFO(IQBFO) algorithm is proposed, which can adaptively make the quantum rotation angle continuously updated and enhance the global search ability. In the initialization process, the modified probability of the optimal rotation angle is introduced to avoid the existence of invariant solutions. The modified operator of probability amplitude is adopted to further increase the population diversity.The tests based on benchmark functions verify the effectiveness of the proposed algorithm. Moreover, compared with the integerorder PID controller, the fractional-order proportion integration differentiation(PID) controller increases the complexity of the system with better flexibility and robustness. Thus the fractional-order PID controller is applied to the servo system. The tuning results of PID parameters of the fractional-order servo system show that the proposed algorithm has a good performance in tuning the PID parameters of the fractional-order servo system. 展开更多
关键词 bacterial foraging algorithm FRACTIONAL-order quantum rotation gate proportion integration differentiation(PID) servo system
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Effect of laser intensity on quantum trajectories in the macroscopic high-order harmonic generation 被引量:2
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作者 Yun Pan Fuming Guo +1 位作者 Yujun Yang Dajun Ding 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第11期52-59,共8页
We macroscopically investigate the effect of the laser intensity and gas density on quantum trajectories in the highorder harmonic generation of Ne atoms irradiated by few-cycle, 800-nm laser pulses. The time–frequen... We macroscopically investigate the effect of the laser intensity and gas density on quantum trajectories in the highorder harmonic generation of Ne atoms irradiated by few-cycle, 800-nm laser pulses. The time–frequency profile of the harmonics shows that the long quantum trajectory is dominant at both lower and higher gas densities for a low laser intensity. At high laser intensities, the long quantum trajectory plays an important role for lower gas densities, while the short quantum trajectory is dominant at higher gas densities. An analysis of the phase mismatch for high-order harmonic generation shows that the primary emission of the quantum trajectories is determined by dynamic changes in the laser electric field during the propagation process. 展开更多
关键词 HIGH-order HARMONIC GENERATION quantum TRAJECTORY
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Parameter-Dependent Third-Order Susceptibility of In_xGa_(1-x)N/GaN Parabolic Quantum Dots
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作者 XIONG Guiguang GUI Zhouqi YU Youqing 《Wuhan University Journal of Natural Sciences》 CAS 2007年第3期452-456,共5页
The electron states confined in wurtzite InxGa1-xN/GaN strained quantum dots (QDs) have been investigated in the effective -mass approximation by solving the Schrtdinger equation, in which parabolic confined potenti... The electron states confined in wurtzite InxGa1-xN/GaN strained quantum dots (QDs) have been investigated in the effective -mass approximation by solving the Schrtdinger equation, in which parabolic confined potential and strong built-in electric field effect (due to the piezoelectricity and spontaneous polarization) have been taken into account. The real part Rex^(3)(0,0,ω) and the imaginary part Imx^(3)(0,0,ω) of the third-order susceptibil- ity describe quadratic electro-optic effects and electro-absorption process of the QDs respectively. And both of them have been calculated in directions parallel and vertical to z axis. Furthermore, the study shows Rex^(3)(0,0,ω) and Imx^(3)(0,0,ω) increase under resonant conditions with the QDs' radius and height increase, and the same results occur when the content increase. In addition, the resonant position shift to the lower energy region when the parabolic frequencies increase. 展开更多
关键词 parabolic quantum dots third order susceptibility piezoelectricity and spontaneous polarization
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SOLVING SECOND ORDER DIFFERENTIAL EQUATIONS IN QUANTUM MECHANICS BYORDER REDUCTION
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作者 C.Ted Chen 《Acta Mathematica Scientia》 SCIE CSCD 2003年第2期274-288,共15页
Solving the famous Hermite, Legendre, Laguerre and Chebyshev equations requires different techniques of unique character for each equation. By reducing these differential equations of second order to a common solvable... Solving the famous Hermite, Legendre, Laguerre and Chebyshev equations requires different techniques of unique character for each equation. By reducing these differential equations of second order to a common solvable differential equation of first order, a simple common solution is provided to cover all the existing standard solutions of these named equations. It is easier than the method of generating functions and more powerful than the Probenius method of power series. 展开更多
关键词 Second order differential equations quantum mechanics common solution
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Higher-order squeezing of quantum field and higher-order uncertainty relations in non-degenerate four-wave mixing
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作者 李希曾 苏保霞 柴路 《Chinese Physics B》 SCIE EI CAS CSCD 2005年第9期1828-1833,共6页
It is found that the field of the combined mode of the probe wave and the phase conjugate wave in the process of non-degenerate four-wave mixing exhibits higher-order squeezing to all even orders. The higher-order squ... It is found that the field of the combined mode of the probe wave and the phase conjugate wave in the process of non-degenerate four-wave mixing exhibits higher-order squeezing to all even orders. The higher-order squeezed parameter and squeezed limit due to the modulation frequency are investigated. The smaller the modulation frequency is, the stronger the degree of higher-order squeezing becomes. Furthermore, the hlgher-order uncertainty relations in the process of non-degenerate four-wave mixing are presented for the first time. The product of higher-order noise moments is related to even order number N and the length L of the medium. 展开更多
关键词 higher-order squeezing higher-order uncertainty relations quantum fields non-degenerate four-wave mixing
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Quantum Dynamics via a Hidden Liouville Space
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作者 Gombojav O. Ariunbold 《Journal of Applied Mathematics and Physics》 2023年第7期1871-1880,共10页
The traditional simulations may occasionally turn out to be challenging for the quantum dynamics, particularly those governed by the nonlinear Hamiltonians. In this work, we introduce a nonstandard iterative technique... The traditional simulations may occasionally turn out to be challenging for the quantum dynamics, particularly those governed by the nonlinear Hamiltonians. In this work, we introduce a nonstandard iterative technique where the Liouville space is briefly expanded with an additional (virtual) space only within ultrashort subintervals. This tremendously reduces the cost of time-consuming calculations. We implement our technique for an example of a charged particle in both harmonic and anharmonic potentials. The temporal evolutions of the probability for the particle being in the ground state are obtained numerically and compared to the analytical solutions. We further discuss the physics insight of this technique based on a thought-experiment. Successive processes intrinsically “hitchhiking” via virtual space in discrete ultrashort time duration, are the hallmark of our technique. We believe that this technique has potential for solving numerous problems which often pose a challenge when using the traditional approach based on time-ordered exponentials. 展开更多
关键词 Liouville Space S-Operator Time-ordered Exponentials quantum Oscillators SQUEEZING Husimi Q-Function
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利用非均匀正交激光选择谐波发射短量子路径
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作者 刘航 刘奥 +1 位作者 史秋月 袁泉 《原子与分子物理学报》 CAS 北大核心 2024年第2期112-116,共5页
理论研究了谐波发射的量子路径在非均匀正交激光场下的调控机制.结果表明,在适当的双色激光偏振角和非均匀参数的组合下,不仅谐波截止能量有明显增大;谐波发射的短量子路径可以被单独选择出来对谐波连续区起到贡献作用.并且,该方案在长... 理论研究了谐波发射的量子路径在非均匀正交激光场下的调控机制.结果表明,在适当的双色激光偏振角和非均匀参数的组合下,不仅谐波截止能量有明显增大;谐波发射的短量子路径可以被单独选择出来对谐波连续区起到贡献作用.并且,该方案在长脉宽激光下依然适用.最后,利用谐波连续区可以获得脉宽在50 as的孤立阿秒脉冲. 展开更多
关键词 高次谐波 短量子路径 非均匀激光场 正交激光场
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基于量子点@有序介孔复合材料的Micro⁃LED色转换特性
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作者 陈晓钢 赵梦云 +6 位作者 蔡俊虎 李恭明 查楠 叶芸 徐胜 郭太良 陈恩果 《发光学报》 EI CAS CSCD 北大核心 2024年第1期59-68,共10页
量子点(Quantum dots)由于具有优异的光电特性,广泛应用于发光与显示、太阳能电池、光催化等领域,它的发现和合成获得了2023年诺贝尔化学奖。采用量子点色转换的Micro-LED全彩化显示技术无需巨量转移,有望实现大规模量产,然而,量子点在... 量子点(Quantum dots)由于具有优异的光电特性,广泛应用于发光与显示、太阳能电池、光催化等领域,它的发现和合成获得了2023年诺贝尔化学奖。采用量子点色转换的Micro-LED全彩化显示技术无需巨量转移,有望实现大规模量产,然而,量子点在高强度Micro-LED出光激发下的性能和寿命仍存在局限。基于此,本文研究了基于量子点@有序介孔(QDs@SBA-15)复合材料的Micro-LED色转换技术及其特性,有序介孔分子筛载体独特的孔道结构不仅能够有效提升Micro-LED色转换和光提取效率,且致密的有序介孔材料也一定程度上保障了量子点的稳定性。首先,通过时域有限差分方法(FDTD)建立了Micro-LED仿真模型,探究量子点粒径和有序介孔材料的孔径对光提取效率的影响;基于仿真结果指导,进一步采用物理共混法制备了QDs@SBA-15复合材料,通过透射光谱、荧光激发光谱、紫外-可见光吸收谱等手段对其进行表征并确定浓度配比;最后,将该复合材料与聚二甲基硅氧烷(PDMS)混合固化成膜,并研究了其光致发光性能。实验结果发现,量子点粒径和介孔材料孔径的匹配度以及量子点和有序介孔材料的比例浓度是影响QDs@SBA-15复合材料发光效率及Micro-LED色转换性能的关键因素;通过优化,所得复合材料可获得优异的发光性能以及良好的环境稳定性,相比于纯量子点色转换层,复合材料的光提取效率提升了81.73%,复合材料的环境稳定性提升了14.33%,以Micro-LED作为蓝光光源组成的三基色发光器件工作色域达到了104.52%NTSC。本研究为量子点色转换Micro-LED显示技术提供了理论指导,为实现Micro-LED全彩化开辟了新路径。 展开更多
关键词 量子点 有序介孔材料 色转换 Micro-LED
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基于半量子安全直接通信的量子拍卖协议
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作者 杨涵 冯雁 谢四江 《量子电子学报》 CAS CSCD 北大核心 2024年第1期125-134,共10页
针对现有量子密封拍卖协议中存在的报价隐私保护不够、恶意竞标者与第三方共谋等问题,提出了一种基于半量子安全直接通信的量子密封投标拍卖协议。该协议采用半量子安全直接通信,通信时拍卖方仅需拥有测量和反射粒子的能力;通过对投标... 针对现有量子密封拍卖协议中存在的报价隐私保护不够、恶意竞标者与第三方共谋等问题,提出了一种基于半量子安全直接通信的量子密封投标拍卖协议。该协议采用半量子安全直接通信,通信时拍卖方仅需拥有测量和反射粒子的能力;通过对投标方报价的保序加密,实现对报价的隐私保护;利用隐私比较,在无第三方参与的情况下,拍卖方也能比较保序加密后的报价信息。理论分析表明面对截获-重发、受控非门(CNOT)、相位反转、共谋等攻击时,所提出协议仍具有较高的安全性,且与同类型量子拍卖协议相比,新协议通信效率不受投标人数的影响。 展开更多
关键词 量子信息 量子拍卖 量子密封投标拍卖 半量子 保序加密 隐私比较
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量子多体系统中的拓扑序与分数化激发
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作者 顾昭龙 李建新 《物理学报》 SCIE EI CAS CSCD 北大核心 2024年第7期1-7,共7页
朗道费米液体理论和金兹堡-朗道相变理论是传统凝聚态物理两座重要的基石,在处理BCS超导体和液氦超流体的形成机制等重要物理问题中取得了巨大成功.然而,以20世纪80年代量子霍尔效应和高温超导的发现为开端,人们逐渐认识到,对于一大类... 朗道费米液体理论和金兹堡-朗道相变理论是传统凝聚态物理两座重要的基石,在处理BCS超导体和液氦超流体的形成机制等重要物理问题中取得了巨大成功.然而,以20世纪80年代量子霍尔效应和高温超导的发现为开端,人们逐渐认识到,对于一大类新的量子态,比如分数量子霍尔态和量子自旋液体,其性质超越了朗道费米液体理论和金兹堡-朗道相变理论.拓扑序及其所具有的长程多体量子纠缠和分数化激发成为我们理解这些奇异量子态的关键概念.在量子材料和量子模拟系统中设计并寻找具有拓扑序的物态、探测并操控其分数化激发是当代凝聚态物理重要的研究方向.近期,在里德伯原子体系、超导量子处理器和二维摩尔超晶格等具有高度可调控性的量子实验平台中,拓扑序的量子模拟和操控得到了快速发展并取得了重要成果.本文将简要论述拓扑序在传统凝聚态材料体系和量子模拟体系中最近的研究进展和挑战,并对该领域未来可能的发展方向做出展望. 展开更多
关键词 拓扑序 长程多体量子纠缠 分数化激发
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莫尔超晶格中的分数化拓扑量子态
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作者 刘钊 《物理学报》 SCIE EI CAS CSCD 北大核心 2024年第20期7-11,共5页
带有分数化准粒子激发的分数量子霍尔态是一种奇特的强关联拓扑量子物态,自1982年在强磁场二维电子气中被首次观测到以来一直是凝聚态物理重要的前沿方向.去年来,有多个团队在基于过渡金属硫族化合物和石墨烯的莫尔超晶格中观测到了零... 带有分数化准粒子激发的分数量子霍尔态是一种奇特的强关联拓扑量子物态,自1982年在强磁场二维电子气中被首次观测到以来一直是凝聚态物理重要的前沿方向.去年来,有多个团队在基于过渡金属硫族化合物和石墨烯的莫尔超晶格中观测到了零磁场分数量子霍尔效应,在莫尔超晶格中还发现了分数量子自旋霍尔效应的迹象.这表明莫尔超晶格体系能够有效调控能带及相互作用,是在零磁场条件下实现分数化拓扑量子态的理想平台.本文简要论述了与此相关的研究进展和存在的挑战,并对该领域未来可能的发展方向做出展望. 展开更多
关键词 莫尔超晶格 分数陈绝缘体 分数量子自旋霍尔效应 非阿贝尔拓扑序
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基于不同物理机制的固体高次谐波产生对激光参数依赖特性的理论研究
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作者 谢贤策 胡子健 +2 位作者 杨志红 王允辉 蒋士成 《华东师范大学学报(自然科学版)》 CAS CSCD 北大核心 2024年第3期101-112,共12页
高次谐波产生(high-order harmonic generation,HHG)机制的研究,主要集中在带间极化和带内电流,以及由Berry曲率引起的反常电流机制上.将强激光诱导完整电流分解为不同机制的贡献,得到长期以来被忽视的混合项电流.通过数值求解半导体Bl... 高次谐波产生(high-order harmonic generation,HHG)机制的研究,主要集中在带间极化和带内电流,以及由Berry曲率引起的反常电流机制上.将强激光诱导完整电流分解为不同机制的贡献,得到长期以来被忽视的混合项电流.通过数值求解半导体Bloch方程(semiconductor Bloch equation,SBE),研究了不同机制产生高次谐波的峰值振幅和激光波长相关性,探索了各电流机制之间的相干性.研究发现,无论是随着波长变化还是随着峰值振幅的变化,混合项电流与带间极化电流诱导的高次谐波谱有着十分相似的变化规律,以及极其接近的谐波强度;同时发现Berry曲率诱导的反常谐波只能产生垂直于激光场偏振方向的偶次谐波,且在波长和峰值强度变化过程中出现的极小值是反常谐波独有的特征.通过分析不同机制之间的干涉作用,发现带间极化谐波与带内谐波(包括反常谐波)在垂直偏振方向上发生了明显的相互干涉,而混合项谐波与带内谐波的相干则微乎其微. 展开更多
关键词 高次谐波产生 Berry曲率 激光诱导电流 量子相干
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利用多周期空间非均匀啁啾场产生单个短阿秒脉冲
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作者 韩岳峰 张刚台 +3 位作者 白婷婷 张依琳 张倩 赵曦 《原子与分子物理学报》 北大核心 2024年第3期105-112,共8页
提出了一种直接生成单个短阿秒脉冲的有效方案.采用数值求解一维含时薛定谔方程,理论研究了多周期空间非均匀啁啾场驱动预激发氦离子的高次谐波辐射和阿秒脉冲的产生.结果表明:在空间非均匀啁啾场作用下,谐波截止可扩展至1050阶次,并且... 提出了一种直接生成单个短阿秒脉冲的有效方案.采用数值求解一维含时薛定谔方程,理论研究了多周期空间非均匀啁啾场驱动预激发氦离子的高次谐波辐射和阿秒脉冲的产生.结果表明:在空间非均匀啁啾场作用下,谐波截止可扩展至1050阶次,并且高于300阶次以上的谐波是连续的.由于连续谱来自单一量子路径的贡献,滤出连续谱上880-1120阶次的谐波,直接产生了一个脉宽为11.4 as的单个脉冲.通过增加驱动脉冲的持续时间,可获得一个脉宽短至10 as的单个脉冲. 展开更多
关键词 高次谐波辐射 孤立阿秒脉冲 量子路径控制 空间非均匀啁啾场
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高阶含时微扰对跃迁速率的修正
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作者 李海凤 欧智敏 +1 位作者 张凯峰 黄岩 《大学物理》 2024年第10期21-25,共5页
费米黄金规则被广泛用于物理、化学、生物等学科理论研究,尤其是量化计算领域.在传统量子力学书籍中,往往忽略微扰高阶修正项,给出低阶微扰近似的跃迁几率或者跃迁速率.对于多态系统,若一阶微扰为零,或费米黄金规则不再适用,面对这种复... 费米黄金规则被广泛用于物理、化学、生物等学科理论研究,尤其是量化计算领域.在传统量子力学书籍中,往往忽略微扰高阶修正项,给出低阶微扰近似的跃迁几率或者跃迁速率.对于多态系统,若一阶微扰为零,或费米黄金规则不再适用,面对这种复杂情况,需要超越费米黄金规则,考虑高阶含时微扰对跃迁速率的影响是非常必要的.本文基于含时微扰理论,考虑常微扰与周期性含时微扰两种情况下推导高阶修正项对于跃迁速率的影响.结果发现当考虑高阶微扰近似时,初末态之间满足一定条件的中间态会对跃迁速率产生影响,这样的结果将更全面地体现实际的量子跃迁过程. 展开更多
关键词 量子力学 含时微扰理论 费米黄金规则 高阶微扰近似
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Ground-state information geometry and quantum criticality in an inhomogeneous spin model
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作者 马余全 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第9期91-96,共6页
We investigate the ground-state Riemannian metric and the cyclic quantum distance of an inhomogeneous quantum spin-1/2 chain in a transverse field. This model can be diagonalized by using a general canonical transform... We investigate the ground-state Riemannian metric and the cyclic quantum distance of an inhomogeneous quantum spin-1/2 chain in a transverse field. This model can be diagonalized by using a general canonical transformation to the fermionic Hamiltonian mapped from the spin system. The ground-state Riemannian metric is derived exactly on a parameter manifold ring S^1, which is introduced by performing a gauge transformation to the spin Hamiltonian through a twist operator. The cyclic ground-state quantum distance and the second derivative of the ground-state energy are studied in different exchange coupling parameter regions. Particularly, we show that, in the case of exchange coupling parameter J a = J b, the quantum ferromagnetic phase can be characterized by an invariant quantum distance and this distance will decay to zero rapidly in the paramagnetic phase. 展开更多
关键词 quantum geometry tensor topological order quantum phase transition
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Multilayer transition in a spin-1 Blume Capel model with RKKY interaction and quantum transverse anisotropy
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作者 N.Tahiri H.Ez-Zahraouy A.Benyoussef 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第1期609-615,共7页
Using mean-field theory, we have studied the effect of quantum transverse anisotropies with RKKY interaction on the multi-layer transition and magnetic properties of the spin-1 Blume-Capel model of a system formed by ... Using mean-field theory, we have studied the effect of quantum transverse anisotropies with RKKY interaction on the multi-layer transition and magnetic properties of the spin-1 Blume-Capel model of a system formed by two magnetic multi-layer materials, of different thicknesses, separated by a non-magnetic spacer of thickness M. It is found that the multilayer magnetic order-disorder transition temperature depends strongly on the value of the transverse anisotropy. The multilayer transition temperature decreases when increasing the transverse anisotropy. Furthermore, there exists a critical quantum transverse anisotropy △xL beyond which the separate transitions occur in the two magnetic layers. The critical transverse anisotropy AxL decreases (increases) on increasing the non-magnetic spacer of thickness M (on increasing the crystal field), and AxL undergoes oscillations as a function of the Fermi level. 展开更多
关键词 quantum transverse anisotropy order-DISorder lavering transitions. RKKY interaction
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Degree of fourth-order coherence by double Hanbury Brown—Twiss detections
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作者 张玉驰 李园 +3 位作者 郭龑强 李刚 王军民 张天才 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第8期411-417,共7页
Photon quantum statistics of light can be shown by the high-order coherence. The fourth-order coherences of various quantum states including Fock states, coherent states, thermal states and squeezed vacuum states are ... Photon quantum statistics of light can be shown by the high-order coherence. The fourth-order coherences of various quantum states including Fock states, coherent states, thermal states and squeezed vacuum states are investigated based on a double Hanbury Brown Twiss (HBT) scheme. The analytical results are obtained by taking the overall efficiency and background into account. 展开更多
关键词 fourth-order coherence quantum state single-photon counting
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Two-dimensional quantum compass model in a staggered field:some rigorous results
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作者 何培松 尤文龙 田光善 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第1期13-22,共10页
We study the properties of the two-dimensional quantum compass model in a staggered field. Using the Perron- Frobenius theorem and the reflection positivity method, we rigorously determine the low energy spectrum of t... We study the properties of the two-dimensional quantum compass model in a staggered field. Using the Perron- Frobenius theorem and the reflection positivity method, we rigorously determine the low energy spectrum of this model and its global ground state ψ0. Furthermore, we show that ψ0 has a directional long-range order. 展开更多
关键词 multi-orbital degree of freedom quantum compass model directional order
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Deterministic secure quantum communication based on entanglement
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作者 HUANG Da-zu CHEN Zhi-gang 《通讯和计算机(中英文版)》 2008年第1期31-36,共6页
关键词 量子通信 量子纠缠 随机偏振角 通信协议
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Simulation and Analysis of Carrier Dynamics in the InAs/GaAs Quantum Dot Laser, Based upon Rate Equations
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作者 Ahmadreza Daraei Seyed Mohsen Izadyar Naser Chenarani 《Optics and Photonics Journal》 2013年第1期112-116,共5页
In this paper, simulation of InAs/GaAs quantum dot (QD) laser is performed based upon a set of eight rate equations for the carriers and photons in five energy states. Carrier dynamics in these lasers were under analy... In this paper, simulation of InAs/GaAs quantum dot (QD) laser is performed based upon a set of eight rate equations for the carriers and photons in five energy states. Carrier dynamics in these lasers were under analysis and the rate equations are solved using 4th order Runge-Kutta method. We have shown that by increasing injected current to the active medium of laser, switching-on and stability time of the system would decrease and power peak and stationary power will be increased. Also, emission in any state will start when the lower state is saturated and remain steady. The results including P-I characteristic curve for the ground state (GS), first excited state (ES1), second excited state (ES2) and output power of the QD laser will be presented. 展开更多
关键词 INAS/GAAS quantum DOT Laser Simulation CARRIER DYNAMICS 4th order RUNGE-KUTTA Method
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