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国家自然科学基金(11264018)

作品数:12 被引量:17H指数:2
相关作者:贾芳胡利云范洪义徐学翔张浩亮更多>>
相关机构:江西师范大学中国科学技术大学更多>>
发文基金:国家自然科学基金江西省自然科学基金江西省教育厅科学技术研究项目更多>>
相关领域:理学机械工程自动化与计算机技术更多>>

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12 条 记 录,以下是 1-10
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光束分离器算符的分解特性与纠缠功能
2014年
光束分离器是量子光学中的基本线性器件之一,它在量子纠缠态的制备与测量上起着重要作用。基于光束分离器(BS)对算符的矩阵变换关系,本文导出了BS算符在若干表象中的自然表示。利用这个自然表示(而非SU(2)李代数关系)及有序算符内的积分技术,可直接导出BS算符的正规乘积、紧指数表示及多种分解形式。此外,可直接导出一种纠缠态表象及其Schmidt分解。这对于讨论连续变量量子隐形传输是十分方便的。
贾芳徐学翔刘寸金黄接辉胡利云范洪义
关键词:纠缠态表象
Phase-sensitive nonclassical properties of photon-added-then-subtracted coherent squeezed states
2012年
We investigate the nonclassical properties of the photon-added-then-subtracted coherent squeezed state (PASCSS) via the sub-Poissonian statistics, the photon-number distribution, and the negativity of the Wigner function. It is found that the PASSCS is a superposition state of D(β)S(ζ)|0〉, D(β)S(ζ)|1〉, and D(β)S(ζ)|2〉. We find that the Mandel Q parameter, the photon-number distribution, and the negative volume of the Wigner function of the PASCSS are all periodic functions of the compound Ф - 0/2 with a period π involved with squeezing and displacement parameteTs.
刘刚吴木生胡利云
A new optical field state as an output of diffusion channel when the input being number state
2014年
By analyzing theoretical scheme of quantum controlling through photon addition,we propose a new optical field whose density operator asρ=λ(1-λ)l:Ll(-λ2aa/1-λ)e-λaa:(here::denotes normal ordering symbol),which is named Laguerre-polynomialweighted chaotic state.We show that such state is the solution to the master equation d/dtρ=-κ(aaρ+ρaa-aρa-aρa),describing a diffusion channel,with the initial number state|l l|,andλ=1/(1+κt).This new state is characteristic of possessing photon number l+κt at time t,so the photon number by adjusting the diffusion parameterκcan be controlled.This master equation is solved using the summation method within ordered product of operators and the entangled state representation.The physical difference between the diffusion and the amplitude damping is noted.
FAN HongYiLOU SenYuePAN XiaoYinHU LiYun
Statistical properties of coherent photon-subtracted two-mode squeezed vacuum and its application in quantum teleportation
2014年
We introduce a kind of non-Gaussian entangled state, which can be obtained by operating a non-local coherent photon-subtraction operation on a two-mode squeezed vacuum. It is found that its normalization factor is only related to the Legendre polynomials, which is a compact expression. Its statistical properties are discussed by the negative region Wigner function with the analytical expression. As an application, the quantum teleportation for coherent states is considered by using the non-Gaussian state as an entangled channel. It is found that the teleportation fidelity can be enhanced by this non-Gaussian operation.
张国平郑凯敏刘世右胡利云
关键词:FIDELITY
A generalized two-mode entangled state: Its generation,properties, and applications被引量:2
2014年
Using the technique of integration within an ordered product of operators we construct a generalized two-mode entangled state, which can be generated by an asymmetrical beam splitter (BS). Some important properties of this state, such as orthogonality and Schmidt decomposition, are also dis- cussed by deriving the expression of BS operator in coordinate representation. As its applications, to conjugate state, obtain operator identities, generate new squeezing operators (squeezed state) are also presented. It is shown that the fidelity of quantum teleportation can be enhanced under certain case by using the asymmetrical new squeezed state as entangled resource.
Kai-Min ZhengShi-You LiuHao-Liang ZhangCun-Jin LiuLi-Yun Hu
任意阶光子先增后减和先减后增相干态的非经典性
2013年
研究了任意阶的光子先增后减(CA)和光子先减后增(AC)相干态的非经典特性,并给出了相应的解析表达式。AC操作和CA操作由于湮灭算符和产生算符的不对易性,导致产生的两种态具有不同的非经典特性。文中首先给出了两种态的归一化因子的解析表达式,随后在此基础上研究了Mandel Q参数、光子数分布和Wigner函数等表征非经典特性的统计量,研究表明两种态都具有非常明显的非经典特性,并且AC操作比CA操作能产生更强的非经典性。
廖小鸽张浩亮胡利云
关键词:光子数分布WIGNER函数
级联光束分离器的纠缠特性及其应用被引量:1
2018年
光束分离器是一个具有广泛应用的线性光学器件,它在非经典量子态特别是纠缠态的制备中具有重要作用.基于单个光束分离器的表象表示,本文进一步考察多个级联光束分离器的纠缠特性,特别是结合有序算符内的积分技术推导了级联光束分离器的正规乘积、紧指数表示及级联算符的表象表示.作为应用,本文利用两个级联光束分离器获得了量子力学表象及其Schmidt分解,并结合量子条件测量制备了qubit态的叠加态.本文的研究方法已被直接推广至多个光束分离器级联情况,相关研究内容为多模纠缠态、多模qubit态的制备提供了一种有效的途径,且为由光束分离器组成的线性器件系统总作用的算符正规乘积及其紧指数表示提供了一般方法.
贾芳贾芳胡银泉张浩亮胡利云范洪义
光子增减叠加相干态在热环境中的退相干被引量:10
2013年
研究了由光子增减叠加操作作用于相干态而得量子态的非经典性及其在热环境中的退相干问题.通过解析导出了Mandel’s Q参数、光子数分布、Wigner函数等,讨论其非经典性.研究表明一阶光子增减相干叠加相干态在相空间总是取负值,只要满足条件|2z*+α-α*|2<1.基于Wigner函数的演化积分公式,解析地推导出了在热环境中Wigner函数的简洁表达式.研究首次表明:如果κt<1/2ln[(2N+2)/(2N+1)]得以满足,一阶光子增减相干叠加相干态在相空间最小值点处Wigner函数分布总存在负部.此外,根据Wigner函数负部体积讨论了其非经典特性.
张浩亮贾芳徐学翔郭琴陶向阳胡利云
关键词:WIGNER函数退相干
单-双模组合压缩热态的纠缠性质及在量子隐形传态中的应用被引量:2
2014年
基于单-双模组合压缩真空态一定范围内能够获得压缩增强的效果,引入单-双模组合压缩热态(DSMST),讨论其纠缠性质.利用Weyl编序算符在相似变换下的不变性,简洁方便地导出了DSMST的纠缠度-负对数值,并给出了当热效应存在时保持纠缠的条件.研究表明:与通常的双模压缩态相比,随着参数的增加,DSMST的纠缠度增加.作为DSMST的应用,利用其实现相干态的量子隐形传输.结果表明:不同于纠缠度随压缩参数增加,保真度获得改善是有条件的,该条件恰好就是一正交分量涨落出现压缩增强的参数区域.此外,解析推导了有效隐形传输保真度(>1/2)的条件.
刘世右郑凯敏贾芳胡利云谢芳森
关键词:WIGNER函数纠缠量子隐形传态
Thermal vacuum state for the two-coupled-oscillator model at finite temperature: Derivation and application
2013年
Following the spirit of thermo field dynamics initiated by Takahashi and Umezawa, we employ the technique of integration within an ordered product of operators to derive the thermal vacuum state (TVS) for the Hamiltonian H of the two-coupled-oscillator model. The ensemble averages of the system are derived conveniently by using the TVS. In addition, the entropy for this system is discussed based on the relation between the generalized Hellmann-Feynman theorem and the entroy variation in the context of the TVS.
徐学翔胡利云郭琴范洪义
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