一维介观结链中电荷孤子的控制

研究了一维介观结链中的电势分布随各岛上门电压和电子数分布的变化关系,并发现在一个岛上加一个门电压会产生一个静电势孤子.通过调节门电压可以较好地控制静电势孤子的形状及其位置,从而达到对电荷孤子的有效控制. 关键词： 电荷孤子 介观结 单电荷隧穿     

Quantum State Transfer in Trapped-Ion-Cavity Systems

We study the information transfer and entanglement transfer in a system consisting of single trapped ions in cavities by the three-mode cross-Kerr-like interaction among the cavity field （photons）, the centre-of-mass motion （phonons） and the internal state of the trapped ion in the Lamb-Dicke and large detuning regime.     

HER磁镜装置中Hα测量及结果

本文描述HER磁镜中Ha面发光度时空分布的测量,发现等离子体发光,扰动,工作模式等呈环状结构;一个良好的热电子环可以抑制扰动环区的低频扰动。     

Effect of Laser Cooling on Frequency Standard of Single Ca^＋ Ion Trapped in a Radio-Frequency Paul Trap

The source of systematic frequency shift of single-ion optical frequency standard of^40 Ca^＋ ion trapped in endcap trap and laser-cooled to a few of mK is analysed and calculated. Second-order Doppler shift, Stark shift due to micromotion and thermal motion, blackbody Stark shift and ac Stark shift are calculated for the ground state and excited 3d ^2D5/2 state. The Hertz-level measurement of the optical clock frequency in a single ^40Ca^＋ ion can be performed.     

Correlative Collapses and Revivals in Two Trapped Ions

An analytic solution is presented for two trapped ions resonantly interacting with laser beams to the first red side-band of the centre-of-mass mode,in the Lamb-Dicke regime and under the rotating wave approximation.This shows the existence of correlative quantum collapses and revivals for the occupation of two atoms.     

Decoherence Sensing of Entangled-Coherent-State Channels via Unambiguous Quantum State Filtering

Unambiguous quantum state filtering is applied to evaluation of the decoherence sensing of entangled quantum channels consisting of N-mode entangled coherent states. It is found that quantum entanglement can enhance the performance of decoherence sensing while the increase of the mode numbers in the entangled probe field can slightly improve the sensing performance only in the weak field regime.     

利用同步辐射与离子阱研究高电离态离子

近年来,各种形式的离子阱作为“清洁”的离子存储器被应用于低能高电离态离子的碰撞和光谱学的研究.同步辐射作为一种新型光源,其能量范围宽,产生的光子能量高,是高电离态产生、电离和激发的有力手段.把二者的优点结合起来,可开辟新的科学生长点.[1] 研究低能高电离态离子,对于实验室等离子体和天体等离子体中的光电离和碰撞过程;对于量子电动力学的精密检验; 对于研究高电离态离子的能极结构和谱线;对于检验和发展光电离以及其他光与离子相互作用理论,都具有非常重要的意义,是当前原子、分子物理学的重要研究前沿. 利用同步辐射光产生离子…     

Measurement of Secular Motion Frequency in Miniature Paul Trap to Ascertain the Stability Parameters

40Ca＋ ions are trapped and laser cooled in a miniature Paul trap. The secular motion was observed by the radio-frequency resonance of the ion cloud and Zeeman profile sidebands of a single ion experimentally. The trap stability parameters a and q are determined with an uncertainty under 1% by the secular motion frequency measurement. The trap efficiency is 0.75. A practicable suggestion is given for the benefits of a new trap design.     

Quantum State Transfer between Charge and Flux Qubits in Circuit-QED

We propose a scheme to implement quantum state transfer in a hybrid circuit quantum electrodynarnics （QED） system which consists of a superconducting charge qubit, a flux qubit, and a transmission line resonator （TLR）. It is shown that quantum state transfer between the charge qubit and the flux qubit can be realized by using the TLR as the data bus.