New applications of dark states in metrology and quantum control -- Visiting Researcher

暗态在计量和量子控制中的新应用——客座研究员

• 批准号: EP/G003440/1
• 负责人: Ferruccio Renzoni
• 金额: $ 2.39万
• 依托单位: University College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2008
• 资助国家: 英国
• 起止时间: 2008 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FG003440%2F1
• 关键词: New; applications; dark; states; metrology

When an atomic system is prepared in a coherent superposition state, extremely narrow Coherent Population Trapping (CPT) and related Electromagnetically Induced Transparency (EIT) resonances can be observed where the atomic coherence cancels, or reduces, absorption.The relevant early studies include measurements performed in Pisa where terms such as dark resonance and atomic population trapping were introduced. The recently expanding interest in the topic is due not only to the fascinating physics involving quantum coherence but also to the fact that there are many potential applications with relevance both in development of new techniques and devices, and in new approaches to fundamental studies, such as slowing oflight, nonlinear optics, quantum information storage, frequency standards, and precisemagnetometers. In the context of frequency standards, it should be noticed that CPT based atomic clocks have been studied in detail by the NIST group, and the first commerciallyavailable Coherent Population Trapping atomic frequency standard is now produced by Kernco, Inc (www.kernco.com).The research described here aims to investigate experimentally new applications of dark states in the domain of metrology and quantum control. This will be done by using cold atoms confined in a dipole trap. This offers significant advantages with respect to a thermal atomic vapour, as commonly used in EIT/CPT studies, and it is essential for the investigation envisaged here. Both measurement on a large cloud of atoms, and on a single trapped atom are planned.The proposer has already made a significant amount of background work needed for the proposed research. A collaboration was also started with Prof. Brana Jelenkovic (Belgrade, Serbia) to acquire the necessary expertise in the techniques specific to the detection and control ofa single atom. Funds are now requested to allow Prof. Jelenkovic to visit UCL for two months during which some key aspects of the experiment will be finalised.

当原子系统处于相干叠加态时，可以观察到极窄的相干布居俘获（CPT）和相关的电磁感应透明（EIT）共振，其中原子的相干性抵消或减少了吸收。相关的早期研究包括在比萨进行的测量，其中引入了暗共振和原子布居俘获等术语。近年来，人们对量子相干性的兴趣不断扩大，这不仅是由于量子相干性的迷人物理学，而且也是由于量子相干性在新技术和新器件的开发以及基础研究的新方法中有许多潜在的应用，如光的慢化、非线性光学、量子信息存储、频率标准和精密磁力计。在频率标准方面，应该注意的是，NIST小组已经详细研究了基于CPT的原子钟，并且第一个商业上可用的相干布居捕获原子频率标准现在由Kernco，Inc（www.kernco.com）生产。这里描述的研究旨在通过实验研究暗态在计量和量子控制领域的新应用。这将通过使用被限制在偶极阱中的冷原子来实现。这提供了显着的优势，相对于热原子蒸气，如EIT/CPT研究中常用的，它是必不可少的调查设想在这里。计划对大量原子云和单个被困原子进行测量。提议者已经为拟议的研究做了大量的背景工作。还开始与Brana Jelenkovic教授（塞尔维亚贝尔格莱德）合作，以获得探测和控制单个原子技术方面的必要专门知识。Jelenkovic教授将访问伦敦大学学院两个月，在此期间，实验的一些关键方面将最终确定。