High-Q Cavity Interface for Color Centers in Thin Film Diamond

• DOI: 10.48550/arxiv.2402.05811
• Publication Date: 2024-02-08
• Authors: Sophie W. Ding; Michael Haas; Xinghan Guo; Kazuhiro Kuruma; Chang Jin; Zixi Li; D. D. Awschalom; Nazar Delegan; F. Joseph Heremans; Alexander A. High; Marko Lončar
• Keywords: Interface (matter)

Quantum information technology offers the potential to realize unprecedented computational resources via secure channels capable of distributing entanglement between quantum computers. Diamond, as a host atom-like defects with optically-accessible spin qubits, is leading platform memory nodes needed extend reach links. Photonic crystal (PhC) cavities enhance light-matter interaction and are essential ingredients an efficient interface spins photons that used store communicate respectively. Despite great effort, however, realization visible PhC high quality factor (Q) design flexibility challenging in diamond. Here, we demonstrate one- two-dimensional fabricated recently developed thin-film diamonds, featuring Q-factors 1.8x10$^5$ 1.6x10$^5$, respectively, highest Qs for realized any material. Importantly, our fabrication process simple high-yield, based on conventional planar techniques, contrast previous approaches rely complex undercut methods. We also fiber-coupled 1D photon extraction efficiency, optical coupling single SiV center such cavity at 4K achieving Purcell 13. The demonstrated diamond photonic will improve performance scalability expand range technologies.