随机分布的平行偶极子内部的场

Superradiant Cooling, Trapping, and Lasing of Dipole-Interacting Clock Atoms

A cold atomic gas with an inverted population on a transition coupled to a field mode of an optical resonator constitutes a generic model of a laser. For quasi-continuous operation, external pumping, trapping and cooling of the atoms is required to confine them in order to achieve enough gain inside the resonator. As inverted atoms are high-field seekers in blue detuned light fields, tuning the cavity mode to the blue side of the atomic gain transition allows for combining lasing with stimulated cavity cooling and dipole trapping of the atoms at the antinodes of the laser field. We study such …

通过非对称平行共振激发实现鲁棒且高保真的受控双量子比特门

Robust and High-Fidelity Controlled Two-Qubit Gates via Asymmetric Parallel Resonant Excitation

本文提出一种鲁棒的共振方案，利用非对称激发和脉冲工程实现任意受控双量子比特门，实验显示在170kHz频移范围内门保真度超过99%。

相互光锥内外原子-原子关联的产生

Generation of atom-atom correlations inside and outside the mutual light cone

我们分析了一对中性二能级原子在有限时间内保持因果断开时是否可以纠缠。与E的互动。M.场在电偶极近似下作微扰处理。我们从一个初始的真空状态，并获得最终的原子相关的情况下，n = 0，1，或2光子产生的时间t，也当最终的场状态是未知的。我们的结果表明，相关性是相当大的内部和外部的相互光锥n= 1和2，也是量子关联成为经典的跟踪场状态。当n = 0时，通过光子在原子间的传播产生纠缠，当n = 1时，这种关联来自于源的不可逆性，当n = 2时，这种关联可能产生纠缠交换。

Pulse amplification in a closed loop $Λ$ system with permanent dipole moments

Propagation of a weak Gaussian probe pulse through a closed loop $Λ$ system with permanent dipole moments (PDMs) is investigated in presence of a strong control field along with a third field. The presence of PDMs allows multi photon excitation, which are otherwise forbidden. The PDMs modify the Rabi frequencies of the probe, control, and the third field inside the medium which noticeably affects the propagation of probe pulse. The probe pulse is amplified during propagation with its Gaussian shape intact. Due to unprohibited two photon excitation it is possible to amplify a probe pulse whose …

原子芯片中电偶极子系综的量子相位

Quantum phases of electric dipole ensembles in atom chips

我们提出了一个相位因子是如何产生时，电偶极子沿着一个封闭的轨迹内的磁场梯度。这种情况与磁场中带电粒子的相似性可以用来模拟凝聚态模型，例如量子霍尔效应和手征自旋哈密顿，将超冷原子集成在原子芯片上。为了说明这一点，我们考虑一个三角形配置的二维光晶格，其中的手征自旋哈密顿量$\vecσ_i \cdot \vecσ_j \times \vecσ_k$可以产生之间的任何三个邻居的晶格产生实验上可实现的手征基态。

量子光学中局域场问题的准简正模方法

Quasi-normal mode approach to the local-field problem in quantum optics

有限尺寸偶极辐射体在有耗非均匀结构中辐射的局域场（LF）问题是一个长期存在的具有挑战性的量子光学问题，随着固态制造技术的快速发展，它变得越来越重要。在这里，我们介绍了一个简单而准确的准简正模（QNM）技术来解决这个问题解析地分离的散射问题的贡献，从QNM和镜像偶极子。利用实腔模型来描述损耗色散金纳米棒中的人工原子，我们证明了量子纳米对低频的贡献何时会超过均匀贡献。我们还展示了如何准确地描述表面散射接近金属界面和探索制度时，表面散射占主导地位的真实腔。我们的研究结果提供了一个直观的图像的基础物理的LF问题，并促进了新的光子源内的有损结构的理解。