Improving the robustness of entangled states by basis transformation
作者：
Wang, Xin-Wen* ;Tang, Shi-Qing;Liu, Yan;Yuan, Ji-Bing
期刊：
Entropy ,2019年21(1):59 ISSN：1099-4300
通讯作者：
Wang, Xin-Wen
作者机构：
[Liu, Yan; Yuan, Ji-Bing; Wang, Xin-Wen; Tang, Shi-Qing] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Liu, Yan; Yuan, Ji-Bing; Wang, Xin-Wen; Tang, Shi-Qing] Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang 421002, Peoples R China.;[Wang, Xin-Wen; Tang, Shi-Qing] Hunan Normal Univ, Minist Educ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China.
通讯机构：
[Wang, Xin-Wen] H;Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang 421002, Peoples R China.;Hunan Normal Univ, Minist Educ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China.
关键词：
Basis transformation;Cat-like states;Entanglement robustness;Local Pauli noises;Robustness-enhancement method
摘要：
In the practical application of quantum entanglement, entangled particles usually need to be distributed to many distant parties or stored in different quantum memories. In these processes, entangled particles unavoidably interact with their surrounding environments, respectively. We here systematically investigate the entanglement-decay laws of cat-like states under independent Pauli noises with unbalanced probability distribution of three kinds of errors. We show that the robustness of cat-like entangled states is not only related to the overall noise strength and error distribution parameters, but also to the basis of qubits. Moreover, we find that whether a multi-qubit state is more robust in the computational basis or transversal basis depends on the initial entanglement and number of qubits of the state as well as the overall noise strength and error distribution parameters of the environment. However, which qubit basis is conductive to enhancing the robustness of two-qubit states is only dependent on the error distribution parameters. These results imply that one could improve the intrinsic robustness of entangled states by simply transforming the qubit basis at the right moment. This robustness-improving method does not introduce extra particles and works in a deterministic manner. © 2019 by the authors.
语种：
英文
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One-step distillation of local-unitary-equivalent GHZ-type states
作者：
Yuan, Jibing;Tang, Shiqing;Wang, Xinwen* ;Zhang, Dengyu
期刊：
QUANTUM INFORMATION PROCESSING ,2018年17(10):1-12 ISSN：1570-0755
通讯作者：
Wang, Xinwen
作者机构：
[Wang, Xinwen; Yuan, Jibing; Zhang, Dengyu; Tang, Shiqing] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Wang, Xinwen; Yuan, Jibing; Zhang, Dengyu; Tang, Shiqing] Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang 421002, Peoples R China.;[Wang, Xinwen] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Minist Educ, Changsha 410081, Hunan, Peoples R China.
通讯机构：
[Wang, Xinwen] H;Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang 421002, Peoples R China.;Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Minist Educ, Changsha 410081, Hunan, Peoples R China.
关键词：
One-step distillation;GHZ-type states;Local unitary equivalence;X states
摘要：
Entanglement distillation plays a very important role in quantum information science. Distillation of high-purity Greenberger–Horne–Zeilinger (GHZ) states has been widely studied. We here show that a pure GHZ-type entangled state or its local unitary (LU)-equivalent state could be extracted from two copies of a particular multipartite mixed state (e.g., an X state) in a single step. Such one-step distillation schemes for LU-equivalent states are expected to shed light on mixed-state manipulation and purification, as well as establish a link between entanglement classification and distillation.
语种：
英文
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基于翻转课堂理念的独立学院大学物理教学模式研究
作者：
许成科;张登玉;杨兴华;邓小辉;汪新文
期刊：
中国教育信息化 ,2018年(1):77-82 ISSN：1673-8454
作者机构：
衡阳师范学院南岳学院,湖南衡阳,421000;[张登玉; 邓小辉; 汪新文] 衡阳师范学院物理与电子信息工程学院,湖南衡阳,421000;[许成科; 杨兴华] 衡阳师范学院
关键词：
大学物理;翻转课堂;独立学院;教学模式
摘要：
翻转课堂作为当今被人们逐渐熟知的一种新型教学理念,将知识传授和知识内化的两个教学过程进行颠倒安排,传统教学中的师生角色和教学组织形式发生了改变。本文介绍了翻转课堂内涵本质,分析了当前独立学院大学物理教学现状,阐述了独立学院大学物理教学引入翻转课堂理念的现实和理论基础,对比国内外翻转课堂教学模式研究结果,结合独立学院大学物理教学实际,提出了独立学院大学物理翻转课堂教学模型,以期为独立学院的大学物理相关课程的教学改革与教学研究提供参考。
语种：
中文
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智慧学习环境中独立学院大学物理微课程教学研究
作者：
许成科;张登玉;唐世清;汪新文
期刊：
大学教育 ,2018年(11):113-116 ISSN：2095-3437
作者机构：
[许成科] 衡阳师范学院南岳学院;衡阳师范学院物理与电子工程学院;[唐世清; 张登玉; 汪新文] 衡阳师范学院
关键词：
大学物理;微课程;认知负荷理论;智慧学习环境;设计
摘要：
微课程以其短小精悍、自由性强的特性逐步受到教育领域的重视,相关联的学习形式革新了传统的教学模式。在当今智慧学习环境中,以微课程为基础的大学物理教学活动更能调动独立学院学生的学习积极性。文章对微课程的概念、特征进行了探讨,结合当前独立学院大学物理教与学的困境,在认知负荷理论的指导下,探讨独立学院大学物理微课程的视频设计制作方法和教学应用模型。
语种：
中文
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阿基米德定律快速演示仪
发明/设计人：
李志强;陈列尊;汪新文;陈银花;周婷;...
申请/专利权人：
衡阳师范学院
申请/专利号：
CN201720921762.4
申请时间：
2017-7-27
公开号：
CN207302433U
公开时间：
2018-05-01
主申请人地址：
421000 湖南省衡阳市珠晖区衡花路16号
摘要：
阿基米德定律快速演示仪，涉及教学仪器设备技术领域，其包括支架、溢水杯、重物、筒状结构的接水容器、一根带指针的弹簧以及用于标记指针位置的标记物；支架包括立杆、横杆以及设于横杆下方的托圈，横杆及托圈连接于立杆，托圈的高度上下可调；弹簧的上端连接横杆，重物设于接水容器内腔中，重物和接水容器均悬吊于弹簧下端，托圈托住溢水杯，接水容器底端封闭且其壳体侧壁上开设缺口，溢水杯及托圈可经缺口放入接水容器内腔中并置于重物的正下方。该阿基米德定律快速演示仪结构紧凑且能直观揭示浮力原理，用该阿基米德定律快速演示仪进行实验教学可以省去演示操作后数值计算的步骤，使得整个实验过程更简短快速，教学效率更高。
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利用基矢变换法求解轨道角动量算符在球坐标系中的表示
作者：
汪新文;唐世清;许成科;张登玉
期刊：
衡阳师范学院学报 ,2018年39(06):33-36 ISSN：1673-0313
作者机构：
衡阳师范学院 物理与电子工程学院,湖南 衡阳,421002;[许成科; 唐世清; 张登玉; 汪新文] 衡阳师范学院
关键词：
轨道角动量算符;球坐标系;直角坐标系
摘要：
力学量算符理论是量子力学的核心内容之一,而轨道角动量又是非常重要的力学量.该文巧妙地利用基矢变换法求出了轨道角动量算符及轨道角动量的三个分量算符在球坐标系中的表示形式,进而用两种方法导出了轨道角动量平方算符在球坐标系中的表示.与传统方法相比,文中的新方法不仅可以简化推导过程、节省教学时间,而且通俗易懂,更容易被接受.该方法在教学实践中已收到良好的反响.
语种：
中文
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二本高校视角下量子物理学课程内容的优化研究
作者：
汪新文;唐世清;邓小辉;张登玉
期刊：
衡阳师范学院学报 ,2018年39(03):51-55 ISSN：1673-0313
作者机构：
衡阳师范学院 物理与电子工程学院,湖南 衡阳,421002;[唐世清; 张登玉; 汪新文; 邓小辉] 衡阳师范学院
关键词：
量子物理学;课程内容;优化研究
摘要：
由于办学定位、办学条件和生源质量等的差异,不同层次的高等学校在相同或相近专业的课程体系和课程内容等的设计上应该有所区别。该文探讨了符合普通二本高校物理学专业实情的量子物理学课程内容优化问题,论述了优化思路和方案。提出的优化措施贯彻了从学科教学走向学科教育的教育理念,有利于学生核心素养的培养。期望其能对地方二本院校物理学或相近专业的量子物理学等课程的教学改革提供一定的参考。
语种：
中文
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提高地方院校教学秘书的专业素养探讨
作者：
赵海燕;汪新文;许成科
期刊：
山西青年 ,2018年(23):81 ISSN：1006-0049
作者机构：
衡阳师范学院物理与电子工程学院,湖南 衡阳,421002;[赵海燕; 许成科; 汪新文] 衡阳师范学院
关键词：
地方院校;教学秘书;专业素养
摘要：
为提高地方院校教学秘书的专业素养,根据我校二级学院教学秘书的工作情况,对教学秘书的专业素养提高进行探索。本文通过对教学秘书的基本素养、工作精神、管理理念、工作方法和人际沟通五个方面进行探讨,进而提高教学秘书的工作激情和提高教学秘书的工作效率。
语种：
中文
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Distilling perfect GHZ states from two copies of non-GHZ-diagonal mixed states
作者：
Wang, Xin-Wen* ;Tang, Shi-Qing;Yuan, Ji-Bing;Zhang, Deng -Yu
期刊：
Optics Communications ,2017年392:185-189 ISSN：0030-4018
通讯作者：
Wang, Xin-Wen
作者机构：
[Yuan, Ji-Bing; Wang, Xin-Wen; Tang, Shi-Qing; Zhang, Deng -Yu] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Wang, Xin-Wen] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct, Changsha 410081, Peoples R China.;[Wang, Xin-Wen] Hunan Normal Univ, Quantum Control Minist Educ, Changsha 410081, Peoples R China.;[Wang, Xin-Wen] Hunan Normal Univ, Synerget Innovat Ctr Quantum Effects & Applicat, Changsha 410081, Peoples R China.;[Yuan, Ji-Bing] Inst Theoret Phys, CAB Key Lab Theoret Phys, Beijing 100190, Peoples R China.
通讯机构：
[Wang, Xin-Wen] H;Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.
关键词：
Distillation;Excited states;Diagonal state;Distillation protocol;Entanglement purification;Local operations and classical communications;Multipartite mixed state;Noisy environment;Non-asymptotic;Output state;Quantum entanglement
摘要：
It has been shown that a nearly pure Greenberger–Horne–Zeilinger (GHZ) state could be distilled from a large (even infinite) number of GHZ-diagonal states that can be obtained by depolarizing general multipartite mixed states (non-GHZ-diagonal states) through sequences of (probabilistic) local operations and classical communications. We here demonstrate that perfect GHZ states can be extracted, with certain probabilities, from two copies of non-GHZ-diagonal mixed states when some conditions are satisfied. This result implies that it is not necessary to depolarize these entangled mixed states to the GHZ-diagonal type, and that they are better than GHZ-diagonal states for distillation of pure GHZ states. We find a wide class of multipartite entangled mixed states that fulfill the requirements. Moreover, we display that the obtained result can be applied to practical noisy environments, e.g., amplitude-damping channels. Our findings provide an important complementarity to conventional GHZ-state distillation protocols (designed for GHZ-diagonal states) in theory, as well as having practical applications. © 2017
语种：
英文
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阿基米德定律快速演示仪
发明/设计人：
李志强,陈列尊,汪新文,陈银花,周婷,姚杰嫆,黄晨,颜艳梅
申请/专利权人：
衡阳师范学院
申请/专利号：
CN201710623142.7
申请时间：
2017-7-27
公开号：
CN107195233A
公开时间：
2017-9-22
主申请人地址：
421000 湖南省衡阳市珠晖区衡花路16号
摘要：
阿基米德定律快速演示仪，涉及教学仪器设备技术领域，其包括支架、溢水杯、重物、筒状结构的接水容器、一根带指针的弹簧以及用于标记指针位置的标记物；支架包括立杆、横杆以及设于横杆下方的托圈，横杆及托圈连接于立杆，托圈的高度上下可调；弹簧的上端连接横杆，重物设于接水容器内腔中，重物和接水容器均悬吊于弹簧下端，托圈托住溢水杯，接水容器底端封闭且其壳体侧壁上开设缺口，溢水杯及托圈可经缺口放入接水容器内腔中并置于重物的正下方。该阿基米德定律快速演示仪结构紧凑且能直观揭示浮力原理，用该阿基米德定律快速演示仪进行实验教学可以省去演示操作后数值计算的步骤，使得整个实验过程更简短快速，教学效率更高。
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论一维δ势阱定态问题的求解方法
作者：
唐世清;许成科;苏卫平;汪新文
期刊：
湖南科技学院学报 ,2017年38(6):12-16 ISSN：1673-2219
作者机构：
衡阳师范学院物理与电子工程学院;[许成科] 衡阳师范学院南岳学院;湖南省益阳市南县第一中学;[唐世清; 汪新文] 衡阳师范学院;[苏卫平] 湖南省南县第一中学
关键词：
量子力学;δ势阱;傅里叶变换;动量表象
摘要：
一维？势阱的束缚态问题是量子力学中重要的一维定态问题。由于存在奇异点,数学上的处理与其它的一维定态问题有很大不同。本文归纳、总结和分析对比一维δ势阱束缚态求解的三种解法（积分极限法、傅里叶变换法和动量表象法）,通过详细的推导过程,展现各种方法的优缺点。对各种方法的特点的分析不仅有利教师和学生对相关问题的理解,更有利于激发了学生的学习兴趣、培养了学生的创新思维。在笔者多年的教学实践中,收到了较好的教学效果。
语种：
中文
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弦振动的固定端点反射数值研究
作者：
张定宗;伍法美;汪新文
期刊：
咸阳师范学院学报 ,2017年32(4):56-59+74 ISSN：1672-2914
作者机构：
衡阳师范学院物理与电子工程学院,湖南衡阳,421002;[张定宗; 汪新文; 伍法美] 衡阳师范学院
关键词：
弦振动问题;端点反射
摘要：
采用传统的方法对弦振动问题进行解析求解时，求解过程不但繁琐，而且很难直接获得解背后隐含的物理意义。基于MATLAB和有限差分法，模拟求解了弦振动的固定端点反射问题并用图像直观地展示了数值结果。计算结果表明固定端点对弦上的入射波具有反射作用，反射方式是将从固定端点传播过去的波以与端点中心对称的形式反射回来，反射波与入射波之间存在相位差，具有半波损失，反射回来的波与原波的叠加即弦的真实振动情况。
语种：
中文
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Temperature Can Enhance Non-Markovianity in Dipolar Bose–Einstein Condensate
作者：
Tang, Shi-Qing;Yuan, Ji-Bing* ;Wang, Xin-Wen;Zhang, Deng-Yu
期刊：
Journal of Low Temperature Physics ,2017年189(3-4):147-157 ISSN：0022-2291
通讯作者：
Yuan, Ji-Bing
作者机构：
[Yuan, Ji-Bing; Zhang, Deng-Yu; Tang, Shi-Qing; Wang, Xin-Wen] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Yuan, Ji-Bing; Zhang, Deng-Yu; Tang, Shi-Qing; Wang, Xin-Wen] Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang 421002, Peoples R China.
通讯机构：
[Yuan, Ji-Bing] H;Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang 421002, Peoples R China.
关键词：
Spectral density;Spin dynamics;Atomic impurities;Dipole interaction;Einstein condensate;Low temperatures;Non-markovian dynamics;Non-Markovianity;Spin boson models;Temperature dependent;Temperature
摘要：
We study temperature effects on non-Markovian dynamics in a model of an atomic impurity qubit immersed in a quasi-two-dimensional dipolar Bose–Einstein condensate , which can be described as a pure dephasing spin-boson model. We use the measure proposed by Breuer et al. (Phys Rev Lett 103:210401, 2009) to characterize non-Markovianity of the quantum process and find for larger relative dipole–dipole interaction, properly low temperature can induce the non-Markovianity enhancement. We give an explanation of the non-Markovianity enhancement that raising temperature can increase the sharpness of the temperature-dependent environmental spectral density. © 2017, Springer Science+Business Media, LLC.
语种：
英文
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Effect of weak measurement on entanglement distribution over noisy channels
作者：
Wang, Xin-Wen* ;Yu, Sixia* ;Zhang, Deng-Yu;Oh, C. H.*
期刊：
Scientific Reports ,2016年6(1):22408 ISSN：2045-2322
通讯作者：
Wang, Xin-Wen;Yu, Sixia;Oh, C. H.
作者机构：
[Zhang, Deng-Yu; Wang, Xin-Wen] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Oh, C. H.; Wang, Xin-Wen; Yu, Sixia; Oh, CH] Natl Univ Singapore, Ctr Quantum Technol, 2 Sci Dr 3, Singapore 117542, Singapore.
通讯机构：
[Wang, Xin-Wen] H;[Wang, XW; Yu, SX; Oh, CH] N;Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;Natl Univ Singapore, Ctr Quantum Technol, 2 Sci Dr 3, Singapore 117542, Singapore.
摘要：
<jats:title>Abstract</jats:title><jats:p>Being able to implement effective entanglement distribution in noisy environments is a key step towards practical quantum communication and long-term efforts have been made on the development of it. Recently, it has been found that the null-result weak measurement (NRWM) can be used to enhance probabilistically the entanglement of a single copy of amplitude-damped entangled state. This paper investigates remote distributions of bipartite and multipartite entangled states in the amplitudedamping environment by combining NRWMs and entanglement distillation protocols (EDPs). We show that the NRWM has no positive effect on the distribution of bipartite maximally entangled states and multipartite Greenberger-Horne-Zeilinger states, although it is able to increase the amount of entanglement of each source state (noisy entangled state) of EDPs with a certain probability. However, we find that the NRWM would contribute to remote distributions of multipartite W states. We demonstrate that the NRWM can not only reduce the fidelity thresholds for distillability of decohered W states, but also raise the distillation efficiencies of W states. Our results suggest a new idea for quantifying the ability of a local filtering operation in protecting entanglement from decoherence.</jats:p>
语种：
英文
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Nonmaximally Entangled States can be Better for Quantum Correlation Distribution and Storage
作者：
Wang, Xin-Wen* ;Tang, Shi-Qing;Yuan, Ji-Bing;Kuang, Le-Man
期刊：
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS ,2015年54(5):1461-1469 ISSN：0020-7748
通讯作者：
Wang, Xin-Wen
作者机构：
[Yuan, Ji-Bing; Kuang, Le-Man; Wang, Xin-Wen; Tang, Shi-Qing] Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China.;[Yuan, Ji-Bing; Kuang, Le-Man; Wang, Xin-Wen; Tang, Shi-Qing] Hunan Normal Univ, Minist Educ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China.;[Wang, Xin-Wen] Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Hengyang 421002, Peoples R China.
通讯机构：
[Wang, Xin-Wen] H;Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Hengyang 421002, Peoples R China.
关键词：
Quantum correlation;Decoherence;Concurrence;Fully entangled fraction;Quantum discord
摘要：
For carrying out many quantum information protocols entanglement must be established in advance between two distant parties. Practically, inevitable interaction of entangled subsystems with their environments during distribution and storage will result in degradation of entanglement. Here we show that some partially entangled states are more robust than maximally entangled states in terms of the residual quantum correlation measured by concurrence, fully entangled fraction, and quantum discord, respectively. This phenomenon leads to the fact that nonmaximally entangled states can outperform maximally entangled states for quantum correlation distribution and storage under the amplitude damping. These results can also educe a noticeable consequence that the ordering of states under quantum correlation monotones can be reversed even by local trace-preserving and completely positive maps. © 2014, Springer Science+Business Media New York.
语种：
英文
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Quantum-discord-triggered superradiance and subradiance in a system of two separated atoms
作者：
Tang, Shi-Qing;Yuan, Ji-Bing;Kuang, Le-Man* ;Wang, Xin-Wen
期刊：
QUANTUM INFORMATION PROCESSING ,2015年14(8):2883-2894 ISSN：1570-0755
通讯作者：
Kuang, Le-Man
作者机构：
[Yuan, Ji-Bing; Kuang, Le-Man; Tang, Shi-Qing; Wang, Xin-Wen] Hunan Normal Univ, Dept Phys, Minist Educ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China.;[Wang, Xin-Wen] Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Hengyang 421002, Peoples R China.
通讯机构：
[Kuang, Le-Man] H;Hunan Normal Univ, Dept Phys, Minist Educ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China.
关键词：
Superradiance;Subradiance;Quantum discord;Quantum statistical properties
摘要：
We investigate collective radiant properties of two separated atoms in X-type quantum states. We show that quantum correlations measured by quantum discord (QD) can trigger and enhance superradiance and subradiance in the two-atom system even though in the absence of interatomic quantum entanglement. We also explore quantum statistical properties of photons in the superradiance and subradiance by addressing the second-order correlation function. In particular, when the initial state of the two separated atoms is the Werner state with nonzero QD, we find that radiation photons in the superradiant region exhibit the nonclassical sub-Poissonian statistics and the degree of the sub-Poissonian statistics increases with increasing of the QD amount, while radiation photons in the subradiant region have either the sub-Poissonian or super-Poissonian statistics depending on the amount of QD and the directional angle. In the subradiant regime, we predict the QD-triggered photon statistics transition from the super-Poissonian to sub-Poissonian statistics. These results shed a new light on applications of QD as a quantum resource.
语种：
英文
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Manipulation of tripartite-to-bipartite entanglement localization under quantum noises and its application to entanglement distribution
作者：
Wang, Xin-Wen* ;Tang, Shi-Qing;Yuan, Ji-Bing;Kuang, Le-Man
期刊：
Journal of Physics B: Atomic, Molecular and Optical Physics ,2015年48(2):025502 ISSN：0953-4075
通讯作者：
Wang, Xin-Wen
作者机构：
[Wang, Xin-Wen] Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Hengyang 421002, Peoples R China.;[Yuan, Ji-Bing; Kuang, Le-Man; Wang, Xin-Wen; Tang, Shi-Qing] Hunan Normal Univ, Minist Educ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China.
通讯机构：
[Wang, Xin-Wen] H;Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Hengyang 421002, Peoples R China.
关键词：
Damping;Quantum computers;Quantum noise;Quantum theory;Classical communication;Decoherence;Entanglement distribution;entanglement localization;Entanglement manipulation;GHZ state;Greenberger-Horne-Zeilinger state;Von Neumann measurement;Quantum entanglement
摘要：
The purpose of this paper is to investigate the effects of quantum noises on entanglement localization by taking an example of reducing a three-qubit Greenberger-Horne-Zeilinger (GHZ) state to a two-qubit entangled state. We consider, respectively, two types of quantum decoherence, i.e. amplitude-damping and depolarizing decoherence, and explore the best von Neumann measurements on one of three qubits of the triple GHZ state for making the amount of entanglement of the collapsed bipartite state be as large as possible. The results indicate that different noises have different impacts on entanglement localization, and that the optimal strategy for reducing a three-qubit GHZ state to a two-qubit one via local measurements and classical communications in the amplitude-damping case is different from that in the noise-free case. We also show that the idea of entanglement localization could be utilized to improve the quality of bipartite entanglement distributing through amplitude-damping channels. These findings might shed a new light on entanglement manipulations and transformations. © 2015 IOP Publishing Ltd.
语种：
英文
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量子力学中的表象变换及其教学方法研究
作者：
汪新文;邓小辉;曾晶;唐世清
期刊：
衡阳师范学院学报 ,2015年(03):26-29 ISSN：1673-0313
作者机构：
衡阳师范学院 物理与电子信息科学系,湖南 衡阳,421002;[曾晶; 唐世清; 汪新文; 邓小辉] 衡阳师范学院
关键词：
表象;表象变换;幺正矩阵;教学方法
摘要：
表象理论是量子力学的重要内容,也是难点。该文深入分析和讨论表象变换的规律和特征,详述量子态和力学量算符在不同表象中的表示之间的内在联系,揭示幺正变换矩阵的特点,提出幺正变换公式的巧妙记忆方法。这些特征和规律将有助于理解、记忆和掌握量子态和力学量算符在不同表象间的变换关系。
语种：
中文
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Nondestructive discrimination of Greenberger-Horne-Zeilinger-basis states via two-qubit parity detection
作者：
Wang XinWen* ;Tang ShiQing;Kuang LeMan
期刊：
中国科学：物理学、力学、天文学英文版 ,2014年57(10):1848-1853 ISSN：1674-7348
通讯作者：
Wang XinWen
作者机构：
[Wang XinWen] Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Hengyang 421002, Peoples R China.;[Tang ShiQing; Wang XinWen; Kuang LeMan] Hunan Normal Univ, Minist Educ, Key Lab Low Dimens Quantum Structures & Quantum C, Changsha 410081, Hunan, Peoples R China.;[Tang ShiQing; Wang XinWen; Kuang LeMan] Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China.
通讯机构：
[Wang XinWen] H;Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Hengyang 421002, Peoples R China.
关键词：
nondestructive GHZ-state analyzer;two-qubit parity gate;photon
摘要：
We propose new methods to construct universal Greenberger-Horne-Zeilinger (GHZ)-state analyzers without destroying the qubits by using two-qubit parity gates. The idea can be applied to any physical systems where the two-qubit parity gate can be realized. We also investigate the feasibility of nondestructively distinguishing the GHZ-basis states for photonic qubits with such an idea. The nondestructive GHZ-state analyzers can act as generators of GHZ entangled states and are expected to find useful applications for resource-saving quantum information processing. © Science China Press and Springer-Verlag Berlin Heidelberg 2014.
语种：
英文
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MANY-TO-ONE REMOTE INFORMATION CONCENTRATION FOR QUDITS AND MULTIPARTITE ENTANGLEMENT
作者：
Wang, Xin-Wen* ;Tang, Shi-Qing;Xie, Li-Jun;Zhang, Deng-Yu;Kuang, Le-Man
期刊：
QUANTUM INFORMATION & COMPUTATION ,2014年14(1-2):122-136 ISSN：1533-7146
通讯作者：
Wang, Xin-Wen
作者机构：
[Zhang, Deng-Yu; Wang, Xin-Wen; Tang, Shi-Qing; Xie, Li-Jun] Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Hengyang 421002, Peoples R China.;[Kuang, Le-Man; Wang, Xin-Wen; Tang, Shi-Qing] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Minist Educ, Changsha 410081, Hunan, Peoples R China.;[Kuang, Le-Man; Wang, Xin-Wen; Tang, Shi-Qing] Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China.
通讯机构：
[Wang, Xin-Wen] H;Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Hengyang 421002, Peoples R China.
关键词：
Remote information concentration;multipartite entanglement;qudit
摘要：
Telecloning and its reverse process, referred to as remote information concentration (RIC), have attracted considerable interest because of their potential applications in quantum-information processing. We here present a general scheme for RIC in d-level systems (qudits), in which the quantum information initially distributed in many spatially separated qudits can be remotely and deterministically concentrated to a single qudit via an entangled channel without performing any global operations. We show that the entangled channel of RIC can be different types of entangled states, including mixed states as well as pure ones. More interestingly, these mixed states include a bound entangled state which has a similar form to the generalized Smolin state but has different characteristics from it. We also show that there exists a multipartite entangled state which can be used to implement both telecloning and RIC in the two-level system. Our many-to-one RIC protocol could be slightly modified to perform some types of many-to-many RIC tasks.
语种：
英文
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