标题： 慢光光子晶体波导中金刚石色心的Purcell增强发射 显示英文标题

标题： Purcell-enhanced emissions from diamond color centers in slow light photonic crystal waveguides

摘要： 基于具有光学可寻址自旋的发射器的量子存储器依赖于高效的光子接口，通常通过具有理想窄光谱线宽和小模式体积的纳米光子腔来实现。 然而，这些方法需要腔模式与量子发射器之间几乎完美的频谱和空间重叠，这可能具有挑战性。 对于固态量子发射器来说尤其如此，因为它们通常是随机定位的，并且可能会遭受显著的非均匀展宽。 一种替代方法是使用慢光波导，这种波导可以在大光学带宽和大面积上增强光-物质相互作用。 在这里，我们展示了钻石慢光光子晶体(PhC)波导，它能够实现对嵌入硅空位(SiV)色心的宽带光学耦合。 我们利用最近展示的薄膜钻石光子平台来制造完全悬空的二维PhC波导。 使用这种方法，我们演示了具有高达70的群指数的波导模式，并观察到与波导模式耦合的SiV的Purcell增强发射。 我们的方法代表了一个实用的钻石平台，用于与色心具有稳健自旋-光子界面的平台。 显示英文摘要

摘要： Quantum memories based on emitters with optically addressable spins rely on efficient photonic interfaces, often implemented as nanophotonic cavities with ideally narrow spectral linewidths and small mode volumes. However, these approaches require nearly perfect spectral and spatial overlap between the cavity mode and quantum emitter, which can be challenging. This is especially true in the case of solid-state quantum emitters that are often randomly positioned and can suffer from significant inhomogeneous broadening. An alternative approach to mitigate these challenges is to use slow-light waveguides that can enhance light-matter interaction across large optical bandwidths and large areas. Here, we demonstrate diamond slow light photonic crystal (PhC) waveguides that enable broadband optical coupling to embedded silicon-vacancy (SiV) color centers. We take advantage of the recently demonstrated thin-film diamond photonic platform to fabricate fully suspended two-dimensional PhC waveguides. Using this approach, we demonstrate waveguide modes with high group indices up to 70 and observe Purcell-enhanced emissions of the SiVs coupled to the waveguide mode. Our approach represents a practical diamond platform for robust spin-photon interfaces with color centers.