Incorporating optical cavities in ion traps is becoming increasingly important in the development of photonic quantum networks. However, the presence of the cavity can hamper efficient laser cooling of ions because of geometric constraints that the cavity imposes and an unfavourable Purcell effect that can modify the cooling dynamics substantially. On the other hand the coupling of the ion to the cavity can also be exploited to provide a mechanism to efficiently cool the ion. In this paper we demonstrate experimentally how cavity cooling can be implemented to improve the localisation of the ion and thus its coupling to the cavity. By using cavity cooling we obtain an enhanced ion–cavity coupling of \(2\pi \times (16.7\pm 0.1)\) MHz, compared with \(2\pi \times (15.2\pm 0.1)\) MHz when using only Doppler cooling.

在光子量子网络的发展中，在离子阱中加入光腔变得越来越重要。然而，由于腔强加的几何约束和可以显着改变冷却动力学的不利的珀塞尔效应，腔的存在会阻碍离子的有效激光冷却。另一方面，也可以利用离子与腔的耦合来提供有效冷却离子的机制。在本文中，我们通过实验演示了如何实施腔冷却以改善离子的定位，从而改善其与腔的耦合。通过使用腔冷却，我们获得了增强的离子-腔耦合\ (2 \ pi \ times (16.7 \ pm 0.1) \) MHz，与\ (2 \ pi \ times (15.2 \ pm 0.1) \) 仅使用多普勒冷却时的 MHz。