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Synchronization of Chaotic Intensities and Phases in an Array of N Lasers

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Communications in Theoretical Physics 2005年第2期43卷 233-239页

作者： SUNJian zhushi-Qun SchoolofPhysicalScienceandTechnology SuzhouUniversitySuzhou215006China

A linear array of N mutually coupled single-mode lasers is investigated. It is shown that the intensities of N lasers are chaotically synchronized when the coupling between lasers is relatively strong. The chaotic synchronization of intensities depends on the location of the lasers in the array. The chaotic synchronization appears between two outmost lasers, the second two outmost lasers, etc. There is no synchronization between nearest neighbors of the lasers. If the number of N is odd, the middle laser is never synchronized between any lasers. The chaotic synchronization of phases between nearest lasers in the array is examined by using the analytic signal and the Gaussian filter methods based on the peak of the power spectrum of the intensity. It can be seen that the message of chaotic intensity synchronization is conveyed through the phase synchronization.

关键词： chaotic synchronization intensity phase linear array solid state lasers

First-Order-Like Phase Transition Induced by Two Different Kinds of Noise in Dispersive Optical Bistability

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Communications in Theoretical Physics 2003年第4X期40卷 435-438页

作者： HEYing zhushi-Qun SchoolofPhysicalScienceandTechnology SuzhouUniversitySuzhou215006China

With unified colored noise approximation, the steady state distribution function in dispersive optical bistability including both intensity and phase fluctuations is obtained. The parameter plane of the first-order-like phase transition is a/so derived with numerical method. It is found that the number of extremes at non-zero values of the output field in the steady state distribution function is changed from zero, two to four. It is shown that the strengths of the intensity fluctuation and the phase fluctuation have great effect on the first-order-fike phase transition.

关键词：白色声子多色声子相位波动相位转变分散光学双稳定性激光系统稳态分布函数

Statistical Properties of a Ring Laser with Injected SIgnal and Backscattering

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Communications in Theoretical Physics 2001年第1期35卷 87-92页

作者： LENGFeng zhushi－Qun DepartmentofPhysics CollegeofSciencesSuzhouUniversitySuzhou215006China

The statistical properties of a homogeneously broadened ring laser with an injected signal are investigated and the normalized two-mode intensity auto- and cross-correlation functions are calculated by a full saturation laser theory with backscattering. The theoretical predictions are in good agreement with the experimental *** investigation reveals that the backscattering can reduce the fluctuations in the system while the full saturation effect plays a major role when the laser is operated above threshold. It is also quite important to notice that the injected signal can drive the weak mode from incoherent light to coherent light.

关键词： homogeneously broadened ring laser injected signal full saturation laser theory backscattering

Digital Communication Using Multi-mode Chaotic Lasers

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Communications in Theoretical Physics 2004年第2期41卷 225-230页

作者： WULiang zhushi-Qun SchoolofPhysicalScienceandTechnology SuzhouUniversitySuzhou215006China

The digital communication in a system of two multi-mode solid state chaotic lasers is investigated theoretically. If the usual method working well in a single-mode laser system is applied to a multi-mode laser system, the memory effect of the two nearest digits can cause high rate of mistakes when the digits are decoded through the subtraction of receiver output from the transmittal. By introducing the deviations of two nearest maximum and minimum fluctuationsof the signal to decode the digit, the message can be decoded correctly. Also, this communication method does not critically depend on the quality of the chaotic synchronization of the two multi-mode lasers.

关键词： digital communication multi-mode lasers chaotic synchronization

Probabilistic Teleportation of Multi-particle d-Level Quantum State

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Communications in Theoretical Physics 2005年第5期43卷 803-805页

作者： CAOMin zhushi-Qun CCAST（WorldLaboratory） P.O.Box8730Beijing100080China

The general scheme for teleportation of a multi-particle d-level quantumstate is presented when m pairs of partially entangled particles are utilized as quantum *** probabilistic teleportation can be achieved with a successful probability of Π from N=0 to d-1of (C_0~N)~2/d~M, which is determined by the smallest coefficients of each entangled channels.

关键词： multi-particle d-level quantum state probabilistic teleportation

First—Order—Like Transition for Dispersive Optical Bistability

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Communications in Theoretical Physics 2003年第1期39卷 57-62页

作者： HEYing zhushi－Qun DepartmentofPhysics CollegeofSciencesSuzhouUniversitySuzhou215006China

The first-order-like phase transition (FOLT) in the dispersive optical bistability is investigated when the fluctuation in the incident light field is considered as colored noise. A unified colored-noise approximation is applied to obtain the steady state distribution (SSD) when either the intensity or phase fluctuations of the incident field are included in the system. For intensity fluctuations only, the curve of SSD is changed from single extreme to two extremes, and then to three extremes. The colored nature of the noise can reduce the fluctuation in the system. However, for phase fluctuations only, the FOLT is mainly induced by the colored nature of the noise. The curve of SSD is changed from single extreme to three extremes directly. There is no FOLT existing for white noise.

关键词： dispersive optical bistability first-order-like phase transition intensity fluctuation phase fluctuation

Generation of Multi-atom Entanglement of Greenberger-Horne-Zeilinger and W States in Cavity QED

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Communications in Theoretical Physics 2004年第2X期42卷 197-200页

作者： ZHANGRong zhushi-Qun SchoolofPhysicalScienceandTechnology SuzhouUniversitySuzhou215006China

A method to prepare multi-particle entanglement of Greenberger-Horne-Zeilinger-type and W-type is proposed through the interaction between the cavity and many atoms simultaneously . After suitable interaction, the selected measurements on the cavity field can create the entangled atomic states. These entangled states can be useful for quantum information manipulation and fundamental study of quantum theory. These states that violate the Bell's inequality are proven.

关键词：多粒子纠缠贝尔不等式空腔量子电动力学 GHZ型纠缠 W型纠缠

Probabilistic Teleportation of n-Particle State via n Pairs of Entangled Particles

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Communications in Theoretical Physics 2005年第1期43卷 69-72页

作者： CAOMin zhushi-Qun SchoolofPhysicalScienceandTechnology SuzhouUniversitySuzhou215006China

The teleportation of an arbitrary n-particle state is proposed when n pairs of entangled particles are utilized as quantum channels. It can be successfully realized with a certain probability which is determined by the smallest coefficients of n entangled pairs. Using a Latin square of order 2n, explicit expressions of two unitary operations corresponding to different Bell-basis measurements performed by Alice can be obtained at the end of Bob.

关键词： probabilistic teleportation n-particle state latin square n pairs ofentangled particles

AFM Study on Reliability of Nanoscale DLC Films Deposited by ECR-MPCVD

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材料热处理学报 2004年第05B期25卷 1260-1262页

作者： ZHUShou-xing zhushi-gen DINGJian-ning SchoolofMechanicalEngineering DonghuaUniversityShanghai200051China Micro／NanoScienceandTechnologyCenter JiangsuUniversityZhenjiang212013China

Nanoindentation, scratch and wear tests based on an atomic force microscope (AFM) were carried out to study the reliability of diamond-like carbon (DLC) films, deposited by electron cyclotron resonance microwave plasma chemical vapor deposition (ECR-MPCVD). The predictors for film reliability were given to investigate the resistance of DLC films to indent, scratch, and wear. Experimental results showed that the films at 64.9nm and 12.07nm exhibited better reliability than thin one at 2.78nm, 4.48nm. In addition, the reliability strength of films above 12.07nm went stable, and the films showed good performance of anti-indentation, and-scratch and anti-wear. Finally, size effect of nanoscale monolayer film was introduced to explain the reliability of nanoscale DLC films.

关键词： AFM DLC ECR-MPCVD 刻痕磨损性能不定形碳