Single-Atom Trapping with Optical Tweezers for Deterministic Loading of Optical Cavities

用光镊捕获单原子以实现光腔的确定性加载

• 批准号: 2616232
• 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: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2616232
• 关键词: Single; Atom; Trapping; Optical; Tweezers

Efficient single-atom single-photon interfaces are essential to many applications in quantum information processing. The potential of such hybridsystems for the delivery of single photons and distributed entanglement has been demonstrated using 87Rb atoms stochastically loaded into a high-finesse optical cavity to achieve strong coupling [? ]. Whilst this source constitutes an excellent testbed, probabilistic loading limits the scalability of its design and gives rise to time-dependent coupling strengths. The solution is to trap and hold a single atom in a tightly focused dipole trap [? ], a technique that relies on the collisional blockade effect. However, the time-averaged probability of single atom occupation in the collisional blockade regime is limited to 0.5 [? ]. In this work, we demonstrate that increasing the depth of a static, optical dipole trap enables the transition from fast loading (ata rate of 0.32 s-1) to long-lifetime trapping (average lifetime of 8.2 s) witha success rate of 98%. This translates to an achievable filling ratio of 0.72. Such a deterministic means of holding a single atom in place is an important step towards the deterministic cavity loading scheme required for a scalable atom-photon quantum interface.

高效的单原子单光子界面对于量子信息处理中的许多应用都是必不可少的。通过将87Rb原子随机加载到高精细光学腔中以实现强耦合，证明了这种混合系统在传输单光子和分布纠缠方面的潜力。虽然这个源构成了一个很好的试验台，但概率载荷限制了其设计的可伸缩性，并产生了依赖于时间的耦合强度。解决方案是将单个原子捕获并保持在紧密聚焦的偶极陷阱中，这是一种依赖于碰撞阻挡效应的技术。然而，在碰撞封锁条件下，单原子被占据的时间平均概率被限制在0.5[？]。在这项工作中，我们证明了增加静态光偶极子陷阱的深度可以实现从快速加载(平均速率为0.32 S~(-1))到长寿命(平均寿命为8.2 S)的转变，成功率为98%。这意味着可实现0.72的充填率。这种将单个原子保持在适当位置的确定性方法是朝着可伸缩原子-光子量子接口所需的确定性空腔加载方案迈出的重要一步。