Many Facets of Laser-Atom and Dipole-Dipole Interactions

激光-原子和偶极-偶极相互作用的多个方面

• 批准号: 1804026
• 负责人: Francis Robicheaux
• 金额: $ 24.5万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1804026&HistoricalAwards=false
• 关键词: Many; Facets; Laser; Atom; Dipole

There has been substantial recent progress using atoms and ions as the working elements in quantum computers and quantum simulators. In addition, there are several proposals to use controlled atoms or ions in complex arrangements to manipulate properties of laser light. Studies of this type are being aggressively pursued in Europe and Asia, and the ability of the US to compete in this arena could be crucial for several technologies. This project will attempt to better simulate several common processes in quantum computers and/or simulators that are often treated in an approximate manner; the goal is to predict which properties are important for a successful quantum computer. In addition, the group will explore the role that cooperative affects among atoms play in these systems and whether the many interactions lead to qualitatively different outcomes. The basic understanding of these systems is difficult; and will require the development of new tools that could be of widespread utility. Because the operation of quantum computers or simulators depends on fragile quantum processes, it is important to understand how the atoms or ions and the lasers interact at a fine level of detail. Even small effects can accumulate over the many atoms or ions and lead to failure. Thus, a major drive of this project is to reduce the approximations in order to reliably predict how these machines will operate.The goal of the projects in this proposal is to understand how small, but possibly important, effects will limit the effectiveness of quantum computers, will control how light is manipulated through the interaction with patterned arrays of atoms, or will display interesting collective phenomena due to the long range dipole-dipole interaction between atoms. One set of projects addresses how the interaction of light with atoms in quantum computers can lead to entanglement of the center of mass motion of the atom with its internal states, which can be a source of decoherence; this entanglement is caused by the momentum kick of photon absorption and/or emission. A second set of projects simulates, at a more detailed level than performed to date, how a patterned array of atoms can manipulate, for example, the direction of a light beam; for example, each photon reflecting from the array must give a momentum kick but whether the kick is coherently or is incoherently spread over several atoms has not been investigated. A last group of projects is proposed to understand basic physics processes that arise when many atoms interact with light; as an example, many atom coherences can develop within the ground state when it has angular momentum greater than zero. The overarching goal for all projects is to investigate complex quantum phenomena involving many particles where the interaction between them is through the retarded and quantized electromagnetic field. Another interest is in understanding how complex behavior can emerge from simple interactions and, thus, could be of wide interest.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.

使用原子和离子作为量子计算机和量子模拟器的工作元素最近取得了实质性进展。此外，还有一些建议使用复杂排列的受控原子或离子来操纵激光的特性。欧洲和亚洲正在积极开展此类研究，美国在这一领域的竞争能力对于多项技术而言可能至关重要。该项目将尝试更好地模拟量子计算机和/或模拟器中的几个常见过程，这些过程通常以近似方式处理；目标是预测哪些属性对于成功的量子计算机很重要。此外，该小组还将探讨原子之间的合作影响在这些系统中所发挥的作用，以及许多相互作用是否会导致性质不同的结果。对这些系统的基本理解是困难的；并且需要开发可以广泛使用的新工具。由于量子计算机或模拟器的运行取决于脆弱的量子过程，因此了解原子或离子和激光如何在精细的细节水平上相互作用非常重要。即使很小的影响也会在许多原子或离子上累积并导致故障。因此，该项目的主要驱动力是减少近似值，以便可靠地预测这些机器将如何运行。该提案中项目的目标是了解微小但可能重要的影响将如何限制量子计算机的有效性，将控制如何通过与原子图案阵列的相互作用来操纵光，或者由于原子之间的长程偶极子-偶极子相互作用而显示有趣的集体现象。一组项目解决了量子计算机中光与原子的相互作用如何导致原子的质心运动与其内部状态的纠缠，这可能是退相干的根源；这种纠缠是由光子吸收和/或发射的动量冲击引起的。第二组项目以比迄今为止更详细的水平模拟原子图案阵列如何操纵，例如光束的方向；例如，从阵列反射的每个光子必须产生动量冲击，但该冲击是否相干或不相干地分布在多个原子上尚未得到研究。最后一组项目旨在理解许多原子与光相互作用时产生的基本物理过程；例如，当角动量大于零时，许多原子相干性可以在基态内产生。所有项目的首要目标是研究涉及许多粒子的复杂量子现象，其中粒子之间的相互作用是通过延迟和量子化的电磁场进行的。另一个兴趣是了解复杂的行为如何从简单的交互中产生，因此可能引起广泛的兴趣。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力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

Calculations of long range interactions for 87 Sr Rydberg states

87 个 Sr Rydberg 态的长程相互作用计算

• DOI: 10.1088/1361-6455/ab4c22
• 发表时间: 2019-12
• 期刊: Molecular and Optical Physics
• 作者: Robicheaux; F
• 通讯作者: F

Photon scattering from a cold, Gaussian atom cloud

来自冷高斯原子云的光子散射

• DOI: 10.1103/physreva.101.013805
• 发表时间: 2020-01
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: Robicheaux, F.;Sutherland, R. T.
• 通讯作者: Sutherland, R. T.

Beyond lowest order mean-field theory for light interacting with atom arrays

超越光与原子阵列相互作用的最低阶平均场理论

• DOI: 10.1103/physreva.104.023702
• 发表时间: 2021-08
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: Robicheaux, F.;Suresh, Deepak A.
• 通讯作者: Suresh, Deepak A.

Photon-induced atom recoil in collectively interacting planar arrays

集体相互作用平面阵列中光子引起的原子反冲

• DOI: 10.1103/physreva.103.043722
• 发表时间: 2021-04
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: Suresh, Deepak A.;Robicheaux, F.
• 通讯作者: Robicheaux, F.

Photon-recoil and laser-focusing limits to Rydberg gate fidelity

光子反冲和激光聚焦对里德伯门保真度的限制

• DOI: 10.1103/physreva.103.022424
• 发表时间: 2021-02
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: Robicheaux, F.;Graham, T. M.;Saffman, M.
• 通讯作者: Saffman, M.