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.

光原子时钟是我们测量时间和频率的最精确的工具之一。在单独系统中的原子钟之间的频率比较用于测量，测量基本常数的时空变化，甚至探测暗物质的结构。独立系统之间这种比较的精度始终受标准量子限制的限制。这项研究旨在利用量子网络的远程纠缠来增强以前的原则证明以超过此限制的频率比较。我们将使用混合物种纠缠操作来连贯地绘制最初在远端离子上生成的远程纠缠到共捕获的钙离子。钙离子具有对磁场波动一阶不敏感的光学转变。我们希望在过渡的寿命限制上进行频率比较，并实现纠缠实践增强的最初几个实例之一。