偶奇qs相干态的非经典特性

利用数值计算方法研究了ｑ和ｓ畸变对双参数形变偶奇ｑｓ相干态量子统计特性的委现偶奇ｑｓ相干态与通常的偶奇相干态有着显著不同的量子统计性质，压缩效应和反聚束效应均可在一定条件下的两种双参数畸变态中出现，偶奇ｑｓ相干态和通常偶奇相干态的差异随ｑ值偏离１越大和ｓ的取值越小而越大。     

Properties of Amplitude N th-power Squeezing of Even and Odd qs-Coherent States

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Quantum Properties of Two-Mode Squeezed Even and Odd Coherent States

Two new types of quantum states are constructed by applying the operator s(ξ) = exp(ξ*ab - ξa b ) on the two-mode even and odd coherent states.The mathematical and quantum statistical properties of such states are investigated.Various nonclassical features of these states,such as squeezing properties,the inter-mode photon bunching,and the violation of Cauchy-Schwarz inequality,are discussed.The Wigner function in these states are studied in detail.     

一种新的奇偶非线性相干态的位相统计性质

根据Pegg-Barnett位相定义, 计算了一种新的奇偶非线性相干态的位相概率分布函数, 利用数值计算方法研究了它们的位相统计性质. 数值计算结果表明：新的奇偶非线性相干态的位相特性与通常奇偶相干态的位相特性截然不同.     

激发奇偶q相干态的统计性质

构造了激发奇q相干态a+mqα〉oq和激发偶q相干态a+mqα〉eq,并通过数值计算研究了参数q和m对平均光子数、亚泊松特性和反聚束效应等统计性质的影响.结果表明:当q偏离1较远时,二阶q相干函数出现振荡现象,其振幅和周期与m无关;平均光子数和MandelQq参数都随着m的增大而急剧增大;只要不是q→1,亚泊松特性和反聚束效应两者是不等价的.     

Phase Properties of New Even and Odd Nonlinear Coherent States

Using the Pegg–Barnett formalism of phase operator, we obtain phase probability distributions of new even and odd nonlinear coherent states. It is shown that the distributions for the states are rather different, and unlike the case of ordinary even and odd coherent states the Pegg–Barnett distribution clearly reflects the different character of quantum interference in the case of the new even and odd coherent states.     

增光子奇偶相干态的相位特性

借助于Pegg-Barnett相位算符理论和数值计算方法,研究了增光子奇偶相干态的相位概率分布,在此基础之上,讨论了有关数算符和相位算符的压缩特性。结果表明,增光子奇偶相干态的相位概率分布与通常的奇偶相干态、非线性相干态不同,在这种新的奇偶相干态中,其Pegg-Barnett相位概率分布能明显地反映出不同的量子相位信息和干涉特性。同时发现,在参量α的某些不同的取值范围内,增光子奇偶相干态在数算符和相位算符分量上均存在压缩效应。     

New Even and Odd Nonlinear Coherent States and Their Nonclassical Properties

Based on Roy and Roy's work (Roy, B. and Roy, P. (2000). Journal of Optics B: Quantum Semiclass. Opt. 2, 65), a new type of even and odd nonlinear coherent states (NCSs) are defined. They result from Schrödinger cat states for deformed field. Using the numerical method, we study nonclassical properties of the new even and odd NCSs. It is shown that quantum statistical properties of the new even and odd NCSs are quite different from those of the usual even and odd coherent states (CSs). It is found that the squeezing only consists in the new even NCS, and the amplitude-squared squeezing and antibunching effect appear for both new even and odd NCSs in some ranges of ||.     

New Even and Odd Nonlinear Coherent States and Their Nonclassical Properties

In this paper, a new kind of even and odd nonlinear coherent states (NLCSs) are introduced. Some nonclassical properties of the states are investigated. It has been found that the new even and odd NLCSs exhibit quadrature squeezing and amplitude-squared squeezing in the Y ₂ direction, however the new odd NLCSs only display sub-Poissonian behaviour. The results show that the nonclassical properties of the new even and odd NLCSs are rather different from those of the usual even and odd coherent states and NLCSs. PACS numbers:42.50.-p, 03.65.-w     

A Class of Even and Odd Nonlinear Coherent States and Their Properties

A class of even and odd nonlinear coherent states are introduced. The properties of some related states, including quadrature squeezing, antibunching effect and phase probability distribution, are studied.     

A Class of Even and Odd Nonlinear Coherent States and Their Properties

A class of even and odd nonlinear coherent states are introduced. The properties of some related states, including quadrature squeezing, antibunching effect, and phase probability distribution, are studied.     

Even and Odd Nonlinear Negative Binomial States

In this paper the even and odd nonlinear negative binomial states of the radiation field are introduced. These states interpolates between even (odd) number states and the even (odd) nonlinear coherent states. The Glauber second-order correlation function is calculated for these states. The squeezing phenomenon (normal and amplitude-squared squeezing), the quasi-probability distribution function Q-function, Wigner-function and the phase properties, are also discussed. Examination of the resonance fluorescence against the present state is given. It has been shown that the atomic inversion is sensitive to any variation in the even and odd nonlinear negative binomial number M and the nonlinearity parameter η.     

双参数形变谐振子奇偶相干态的高阶压缩特性

研究了双参数qs形变谐振子奇偶相干态中光场的高阶压缩特性,并用数值计算方法定量研究了形变参数q和s对这一特性的影响规律.结果表明,qs形变谐振子奇偶相干态均可能呈现奇次方阶压缩效应却无偶次方阶压缩效应,这与谐振子没有形变时的通常情况是不同的.当q和s取一定值时,在qs形变相干态中谐振子强度r²取值的一定范围内,这种反常特性的范围随着q偏离1越大s取值越小而变大.有关单参数q形变奇偶相干态的结论作为特例包含在本文的一般结论之中.     

减少光子奇(偶)对相干态的非经典特性

构造了减少光子奇对相干态与减少光子偶对相干态,并用数值模拟方法研究了它们的非经典特性。结果表明,从奇对相干态与偶对相干态的第一个场模取走光子,可以显著地增强第二个场模的光子统计亚泊松分布特性;从奇对相干态的第一个场模取走光子后,在双模光子消灭算符本征值的模较小时可以增强第一个场模的光子反聚束性质。从偶对相干态的第一个场模取走光子,在双模光子消灭算符本征值的模较小时第二个场模的光子反聚束效应得到明显增强。     

Even and Odd Charge Coherent States: Higher-Order Nonclassical Properties and Generation Scheme

We examine the higher-order nonclassical properties of the even and odd charge coherent states as well as proposing a scheme to generate these states whose modes can freely travel in open space. We show that the even and odd charge coherent states exhibit both higher-order antibunching and higher-order squeezing. While the two-mode higher-order antibunching occurs in any order and essentially depends on the charge number, the two-mode higher-order squeezing appears only in the even orders. We also prove that these states are genuinely entangled, and they can be generated by means of cross-Kerr media, beam splitters, phase shifts and threshold detectors. We find that the fidelity and the corresponding success probability to generate these states are dependent on the correlative parameters.     

Nonclassical Properties in Mesoscopic Josephson Junction with Excited Even and Odd Coherent States

Dynamic evolution of a mesoscopic Josephson junction (M J J) interacting with excited even and odd coherent states is studied. It is shown that the supercurrent in MJJ exhibits both collapse and revival (CR) phenomenon and squeezing effect. It is also shown that the CR and squeezing of supercurrent are related to degree of excitation and average photon number.     

Nonclassical Properties in Mesoscopic Josephson Junction with Excited Even and Odd Coherent States

Dynamic evolution of a mesoscopic Josephson junction (MJJ) interacting with excited even and odd coherent states is studied. It is shown that the supercurrent in MJJ exhibits both collapse and revival (CR) phenomenon and squeezing effect. It is also shown that the CR and squeezing of supercurrent are related to degree of excitation and average photon number.     

Statistical Properties of the Odd Binomial States with Dynamical Applications

In this paper we investigate the odd binomialstate, which interpolates between odd number and oddcoherent states. We discuss the statistical propertiesof the Glauber second-order correlation function and squeezing phenomena (normal squeezing andamplitude-squared squeezing). The phase properties inPegg-Barnett formalism are considered, and thequasiprobability distribution functions are examined.The dynamics of the Jaynes-Cummings model and theresonance fluorescence are also discussed.     

奇偶相干迭加态的振幅高次方压缩

本文引入了学子消灭算符四次方算符α＾４新的正交归一本征态：奇偶相干态和奇偶相干迭加态，并研究了奇偶相干迭加态的振幅高次方压缩特性。     

双模最小关联混态的量子统计性质

研究了双模最小关联混态在不同参数情况下的量子统计性质.发现在一定的参数范围内双模最小关联混态的二阶相干性违反经典的Cauchy-Schwartz不等式,呈现非经典性相关;同时对双模最小关联混态的压缩特性、亚泊松分布等非经典性质进行了分析,通过数值计算得出,每模光子的压缩性及其亚泊松分布均与参数d的取值密切相关.