biostudies-literatureUnknown15(1)Ding SWQuantum information technology offers the potential to realize unprecedented computational resources via secure channels distributing entanglement between quantum computers. Diamond, as a host to optically-accessible spin qubits, is a leading platform to realize quantum memory nodes needed to extend such quantum links. Photonic crystal (PhC) cavities enhance light-matter interaction and are essential for an efficient interface between spins and photons that are used to store and communicate quantum information respectively. Here, we demonstrate one- and two-dimensional PhC cavities fabricated in thin-film diamonds, featuring quality factors (Q) of 1.8 × 10⁵ and 1.6 × 10⁵, respectively, the highest Qs for visible PhC cavities realized in any material. Importantly, our Nature communications6358https://www.ebi.ac.uk/biostudies/studies/S-EPMC11284222biostudies-literatureHigh-Q cavity interface for color centers in thin film diamond.PMC11284222Kuruma KLi ZDing SWLoncar MGuo XJin CHigh AAHeremans FJHaas MAwschalom DDDelegan NfalseHigh-Q cavity interface for color centers in thin film diamond.Quantum information technology offers the potential to realize unprecedented computational resources via secure channels distributing entanglement between quantum computers. Diamond, as a host to optically-accessible spin qubits, is a leading platform to realize quantum memory nodes needed to extend such quantum links. Photonic crystal (PhC) cavities enhance light-matter interaction and are essential for an efficient interface between spins and photons that are used to store and communicate quantum information respectively. Here, we demonstrate one- and two-dimensional PhC cavities fabricated in thin-film diamonds, featuring quality factors (Q) of 1.8 × 10⁵ and 1.6 × 10⁵, respectively, the highest Qs for visible PhC cavities realized in any material. Importantly, our 2024-01-01T00:00:00Z2024 Jul2026-06-01T10:01:18.162Z2025-04-04T20:24:32.411ZS-EPMC112842223906953610.1038/s41467-024-50667-5