An atom in front of a surface is one of the simplest and fundamental problem in physics. Yet, it allows testing quantum electrodynamics, while providing potential platforms and interfaces for quantum technologies. Despite, its simplicity, combined with strong scientific and technological interests, atom-surface physics, at its fundamental level, remains largely unexplored mainly because of challenges associated with precise control of the atom-surface distance. Nevertheless, substantial breakthroughs have been made over the last two decades. With the development of cold and quantum atomic gases, one has gained further control on atom-surface position, naturally leading to improved precision in the Casimir-Polder interaction measurement. Advances have also been reported in finding experimental knobs to tune and even reverse the Casimir-Polder interaction strength. So far, this has only been achieved for atoms in short-lived excited states, however, the rapid progresses in material sciences, e.g. metamaterials and topological materials have inspired new ideas for controlling the atom-surface interaction in long-lived states. In addition, combining nano-photonic and atom-surface physics is now envisioned for applications in quantum information processing. The first purpose of this review is to give a general overview on the latest experimental developments in atom-surface physics. The second main objective is to sketch a vision of the future of the field, mainly inspired by the abundant theoretical works and proposals available now in the literature.
Recent progress in the description of positron scattering from atoms using the Convergent Close-Coupling Theory
自Surko,Gribakin和Buckman [J. Phys. B 38,R57(2005)]综述以来的十年中,正电子在原子上散射的理论研究取得了很大进展。我们回顾了这一进展,特别强调了两个中心的收敛紧密耦合和其他理论,明确治疗电子偶素(Ps)的形成少电子目标。虽然已经取得了实质性的进展,形成Ps的正电子散射的少电子目标,相当大的理论发展仍然需要多电子原子和分子的目标。
利用微扰论中的对偶性原理,重新审视了二能级原子的微扰论范式,讨论了它的微扰论分析。我们考虑的模型是一个二能级原子和一个二能级原子系综与一个单模辐射相互作用。目的是看看后者如何实际上可以作为一个放大器的量子波动的经典水平,通过热力学限制的一个非常大的系综的二能级原子[M。Frasca,Phys. Lett. A { \bf 283},271(2001)]以及如何去除薛定谔猫态。热力学极限对于在没有耗散的情况下演化的量子系统上产生经典态和退相干是非常有效的。没有耗散的消相干实际上是一个二能级原子与二能级原子系综相互作用的效应,这种情况被证明有助于理解最近在纳米级器件上进行的实验,这些实验表明在非常低的温度下量子相干性意外消失。
Ultracold atomic lattice systems for simulating topological phases: A review
School of Physics and Institute for Quantum Science and Engineering, Huazhong University of Science and Technology(华中科技大学物理学院与量子科学与工程研究院);Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China(中国科学技术大学微尺度物质科学国家研究中心与物理科学学院);Shanghai Research Center for Quantum Sciences and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China(中国科学技术大学上海量子科学研究中心与中科院量子信息重点实验室);Hefei National Laboratory(合肥国家实验室)