Optical atomic clocks

光学原子钟

• 批准号: 2886916
• 金额: --
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2886916
• 关键词: Optical; atomic; clocks

Optical atomic clocks are one of our most precise tools to measure time and frequency. Frequency comparisons between atomic clocks in separate systems are used for geodesy, measuring the space time variation of fundamental constants, and even probing the structure of dark matter. The precision of such comparisons between independent systems will always be limited by the standard quantum limit. This research aims to use the remote entanglement from a quantum network to enhance such frequency comparisons beyond this limit, building upon our previous proof-of-principle demonstration. We will use mixed-species entangling operations to coherently map the remote entanglement initially generated on remote strontium ions to co-trapped calcium ions. Calcium ions have an optical transition that is first-order insensitive to magnetic field fluctuations; we hope to perform frequency comparisons at the lifetime limit of the transition and achieve one of the first few instances of a practical enhancement with entanglement.

光学原子钟是我们测量时间和频率的最精确的工具之一。不同系统中的原子钟之间的频率比较被用于大地测量，测量基本常数的时空变化，甚至探测暗物质的结构。独立系统之间的这种比较的精确度总是受到标准量子极限的限制。这项研究旨在利用量子网络的远程纠缠来增强这种超越这一限制的频率比较，建立在我们之前的原理证明演示的基础上。我们将使用混合物种纠缠操作来相干地将最初在远程锶离子上产生的远程纠缠映射到共捕获的钙离子。钙离子具有对磁场波动不敏感的一阶光学跃迁；我们希望在跃迁的寿命极限上进行频率比较，并实现少数几个利用纠缠进行实际增强的实例之一。