Quantum Phases, Interactions and Topology of Dressed BECs

修饰 BEC 的量子相、相互作用和拓扑

• 批准号: 1912540
• 负责人: Peter Engels
• 金额: $ 57.95万
• 依托单位: Washington State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1912540&HistoricalAwards=false
• 关键词: Quantum; Phases; Interactions; Topology; Dressed

When a gas of atoms is cooled to a temperature close to absolute zero, it exhibits unusual behavior described by the theory of quantum mechanics. According to this theory, atoms have both a particle-like and a wave-like nature at the same time, which gives rise to behaviors that do not seem intuitive based on ordinary experience in everyday life. This project consists of a line of research using tailored laser and radio-frequency fields to investigate inherently quantum mechanical phenomena including unusual states of matter, the role of interatomic interactions in precision measurement schemes, and a new paradigm for modelling general quantum systems using ultracold atoms. This project will promote the progress of science and technology by providing insight into intricate quantum mechanical effects in a well-controlled environment that involves quantum complexities while remaining simple enough to be amenable to the development of new mathematical descriptions. Since quantum mechanical behavior becomes dominant not only in the realm of ultracold temperatures but also in the realm of very small dimensions, the knowledge acquired through this project will also provide impetus for the development of next generation nanoelectronics devices, for precision measurement or for quantum information. This project uses dilute-gas Bose-Einstein condensates formed by cooling rubidium atoms to temperatures near zero Kelvin. The atoms in the condensate form a macroscopic quantum system that can be manipulated and probed in very flexible ways. The project consists of a series of steps: First, by employing a suitably tailored light field comprised of the superposition of a Raman coupling field and an optical lattice, the excitation spectrum of a supersolid-like state will be studied that the Principal Investigator has recently realized in the lab. Second, a set of precision measurements will investigate the role of interaction effects in Raman dressing schemes and radio-frequency coupling schemes within the context of atom interferometry. This will illuminate the importance of interactions for quantum analog simulations. A clear cut demonstration of these interaction effects will be provided in the context of a spin tensor-momentum coupling scheme that leads to a variety of novel quantum phases. Finally, a new paradigm for quantum analog simulation will be experimentally realized by exploiting the parameter space of coupled internal states. This method has the potential to realize topological monopoles, enhancing our insight into advanced quantum mechanical concepts.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

当原子气体被冷却到接近绝对零度的温度时，它会表现出量子力学理论所描述的不寻常行为。根据这一理论，原子同时具有粒子和波的性质，这就产生了基于日常生活中的普通经验似乎不直观的行为。该项目包括一系列研究，使用定制的激光和射频场来研究固有的量子力学现象，包括物质的不寻常状态，原子间相互作用在精密测量方案中的作用，以及使用超冷原子模拟一般量子系统的新范例。该项目将促进科学和技术的进步，在一个涉及量子复杂性的良好控制环境中提供对复杂量子力学效应的洞察，同时保持足够简单，以适应新的数学描述的发展。由于量子力学行为不仅在超冷温度领域占据主导地位，而且在非常小的维度领域也占据主导地位，通过该项目获得的知识也将为下一代纳米电子设备的发展提供动力，用于精确测量或量子信息。这个项目使用稀薄气体，将铷原子冷却到接近零开尔文的温度形成玻色-爱因斯坦凝聚体。凝聚态中的原子形成了一个宏观的量子系统，可以以非常灵活的方式进行操作和探测。该项目包括一系列步骤：首先，通过采用由拉曼耦合场和光学晶格叠加组成的合适的定制光场，将研究首席研究员最近在实验室中实现的超固体态的激发光谱。其次，在原子干涉测量的背景下，一组精密测量将研究相互作用效应在拉曼修整方案和射频耦合方案中的作用。这将阐明相互作用对量子模拟模拟的重要性。这些相互作用效应的清晰演示将在导致各种新量子相的自旋张量-动量耦合方案的背景下提供。最后，利用耦合内态的参数空间，在实验上实现量子模拟模拟的新范式。这种方法有可能实现拓扑单极子，增强我们对先进量子力学概念的洞察力。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Stability in turbulence: The interplay between shocks and vorticity in a superfluid with higher-order dispersion

• DOI: 10.1103/physreva.102.053310
• 发表时间: 2020-04
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: M. Mossman;E. Delikatny;M. Forbes;P. Engels

Observation and analysis of multiple dark-antidark solitons in two-component Bose-Einstein condensates

• DOI: 10.1103/physreva.102.023301
• 发表时间: 2020-02
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: G. Katsimiga;S. Mistakidis;T. Bersano;M. Ome;S. Mossman;K. Mukherjee;K. Mukherjee;P. Schmelcher-P.-Schmel

Rabi oscillations and Ramsey-type pulses in ultracold bosons: Role of interactions

超冷玻色子中的拉比振荡和拉姆齐型脉冲：相互作用的作用

• DOI: 10.1103/physreva.101.063620
• 发表时间: 2020
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: Guan, Q.;Bersano, T. M.;Mossman, S.;Engels, P.;Blume, D.
• 通讯作者: Blume, D.