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Controlling Nonclassical Atomic Spin Ensembles via Cavity-Enhanced Polarization Measurements

通过腔增强偏振测量控制非经典原子自旋系综

基本信息

批准号：
2011582
负责人：
Ivan Deutsch
金额：
$ 30.39万
依托单位：
University of New Mexico
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-09-01 至 2024-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2011582&HistoricalAwards=false
关键词：
Controlling Nonclassical Atomic Spin Ensembles

项目摘要

Quantum Information Science (QIS) is an emerging field that will fuel the next digital information revolution. It is based on the revolutionary idea that when information is manipulated at the microscopic level of atoms and photons the strange laws of physics enable ultrafast computers, enhanced cyber security, and ultraprecise sensors. Accelerating progress in QIS is the goal of the National Quantum Initiative Act of 2018, to enhance the nation’s security and economic growth. This grant helps to achieve these goals by developing a new atom-photon interface with potential applications in quantum computing, communications, and sensing. It does so through basic research in theoretical atomic physics which is essential for the development of next-generation information processing technologies. The project involves the training of students who will create the new quantum-smart workforce. The goal of this project is to develop a new platform for an entangling atom-light interface that can be used to create nonclassical states of atomic spin ensembles for applications in metrology, quantum communication, quantum computation, and fundamental studies of complex many-body dynamics. This platform is based on a ring-cavity geometry that enables a strong birefringent dispersive interaction between atomic spins encoded in magnetically insensitive clock states of cesium atoms and the polarization of the light. Measurement of the light polarization at the cavity output port induces quantum backaction of the collective atomic spin. The project will explore both Gaussian (homodyne) measurements of the light to induce Gaussian entangled states of atoms (spin squeezing), nonGaussian (photon counting) measurements to induce nonGaussian atomic spin states (Dicke states), as well as hybrid approaches analogous to photon addition on a squeezed vacuum state. The group will develop new approaches to quantum state verification and tomography based on detailed understanding of continuous measurement quantum trajectories. Additionally, the group will develop a new approach to measurement-based feedback to create complex dynamical maps of the collective spins and enable studies of quantum chaos, the quantum-to-classical transition, and quantum simulation of many-body physics.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.

量子信息科学（QIS）是一个新兴领域，将推动下一次数字信息革命。它基于一个革命性的想法，即当信息在原子和光子的微观层面上被操纵时，奇怪的物理定律使超快的计算机、增强的网络安全以及超精密的传感器成为可能。加快量子信息系统的进展是2018年《国家量子倡议法案》的目标，以加强国家安全和经济增长。这项拨款通过开发一种新的原子-光子界面，在量子计算、通信和传感方面具有潜在的应用，帮助实现这些目标。它通过理论原子物理学的基础研究来实现这一目标，这对下一代信息处理技术的发展至关重要。该项目包括对学生的培训，这些学生将创造新的量子智能劳动力。该项目的目标是为纠缠原子-光界面开发一个新的平台，该平台可用于创建原子自旋系综的非经典状态，用于计量学，量子通信，量子计算和复杂多体动力学的基础研究。该平台基于环形腔几何结构，能够在铯原子的磁不敏感时钟状态和光的偏振中编码的原子自旋之间产生强烈的双折射色散相互作用。在空腔输出口测量光偏振引起集体原子自旋的量子反作用。该项目将探索高斯（零差）光测量来诱导原子的高斯纠缠态（自旋压缩），非高斯（光子计数）测量来诱导非高斯原子自旋态（迪克态），以及类似于压缩真空态上的光子添加的混合方法。该小组将基于对连续测量量子轨迹的详细理解，开发量子态验证和断层扫描的新方法。此外，该小组将开发一种新的基于测量的反馈方法，以创建集体自旋的复杂动态图，并使量子混沌、量子到经典跃迁和多体物理的量子模拟研究成为可能。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。