胞嘧啶Ag电极上的表面增强拉曼光谱

胞嘧啶Ａｇ电极上的表面增强拉曼光谱朱克荣（安徽大学现代实验技术中心合肥２３００３９）曹卓良，陈鹤平，赵华正，龙长应（安徽大学物理系合肥２３００３９）Ｓｕｔｒｆａｃｅ－ＥｎｈａｎｃｅｄＲａｍａｎＳｐｅｃｔｒｏｓｃｏｐｙｏｆＣｙｔｏｓｉｎｅＡｄｓｏｒｂｅ...     

量子拍频系统的拉曼散射

量子拍频系统的拉曼散射曹卓良，朱克荣，赵华正（安徽大学物理系合肥２３００３９）ＲａｍａｎＳｃａｔｔｅｒｉｎｇＥｆｆｅｃｔｏｆＡＱｕａｎｔｕｍ－ｂｅａｔＡｔｏｍｉｃＳｙｓｔｅｍ￥ＣａｏＸｈｕｏｌｉａｎｇ；ＺｈｕＫｅｒｏｎｇａｎｄＺｈａｏＨｕａｚｈｅｎｇ...     

双模纠缠相干光场与Ⅴ型三能级原子相互作用系统的原子偶极压缩效应

采用求解Schrodinger方程和数值计算方法,研究了双模纠缠相干光场与Ⅴ型三能级原子相互作用过程中原子偶极算符的压缩效应,结果表明:此压缩效应与双模纠缠光场的纠缠程度、失谐量相关联.     

两纠缠原子与光场相互作用系统场熵演化特性

研究了两纠缠原子与相干态光场相互作用系统场熵的时间演化特性,运用全量子力学理论和数值方法,讨论了初始两原子所处的纠缠状态、纠缠度和腔内光场的强弱对场熵的影响.随着光场平均光子数的增加,系统场熵均值和振荡频率增大;光场较弱时,场熵呈现一定的周期性振荡;光场增强后,场熵呈现出周期性的崩塌与回复,且随初始两原子纠缠度的增加,场熵的振幅增大.     

Generation of Multipartite Ionic Entangled States only by Single-Qubit Measurements via Linear Optical Elements

We propose a scheme for generation of multipartite ionic Greenberger-Horne-Zeilinger （GHZ） states only by single-qubit measurements. Our scheme not only does not need joint measurements but also avoids the difficulty of synchronizing the arrival time of the two scattered photons, which is faced by the previous schemes. Therefore our entanglement generation scheme can be implemented more easily than the schemes based on atomic interference in experiment.     

克尔介质中双模纠缠相干光与贝尔态原子相互作用系统的光子统计特性

运用全量子理论并结合数值计算方法,研究了克尔介质腔中处于贝尔态的两个全同二能级纠缠原子与双模纠缠相干光场相互作用系统的光子统计特性。讨论了双原子体系的初态、初始光场的平均光子数、双模纠缠相干光场的纠缠程度以及克尔介质与双模光场的耦合强度对光子统计特性的影响。结果表明:忽略克尔介质的作用时,只有当双原子体系的初态为0β1〉或1β1〉时,在一定的条件下才可出现光子的反聚束效应,而当双原子体系的初态为β00〉、1β0〉时,光场在其演化过程中不出现光子的反聚束效应。而当考虑克尔介质的作用时,四种初态下光场演化过程中均有可能出现光子的反聚束效应。光子的反聚束效应出现的次数、时间和深度极其敏感地依赖于初始光场的平均光子数和克尔介质与双模光场的耦合强度,同时也受到双模纠缠光场的纠缠程度的影响。     

双模光场与运动三能级原子作用系统的反聚束效应

采用求解Schrdinger方程和数值计算方法,研究了双模纠缠相干光场与运动V型三能级原子相互作用过程中的聚束和反聚束效应.结果表明:平均光子数变动不大,系统就会由聚束效应跃变为反聚束效应,关联程度最强;平均光子数取一定数值时,原子运动速度增大引起时间演化曲线显著上移,振荡周期变小,对系统的聚束和反聚束效应也有较强影响.当平均光子数较大时,原子初态和双模纠缠相干光场的纠缠度无任何影响;仅当平均光子数较小时,原子初态和双模纠缠相干光场的纠缠度变化引起曲线振荡幅度变化,位置发生小幅度移动,产生弱关联.     

Preparation of cluster state in large detuned cavity

An experimentally realizable physical scheme for preparing multiqubit cluster states from a large detuned atomcavity interaction is proposed. The scheme is free of any type of measurement and insensitive to the cavity decay, and the cavity field is only virtually excited so that there is no information exchanging between atom and cavity. The time required for the gate operations is very short, which is important for decoherence. We also discuss the experimental feasibility of our scheme.     

Quantum superdense coding via cavity-assisted interactions

Quantum superdense coding (QSC) is an example of how entanglement can be used to minimize the number of carriers of classical information. This paper proposes two schemes for implementing QSC by means of cavity assisted interactions with single-photon pulses. The schemes are insensitive to the cavity decay and the thermal field, thus it might be realizable based on the current cavity QED techniques.