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Q: Fachverband Quantenoptik und Photonik
Q 80: Quantum Technologies – Color Centers III
Q 80.5: Talk
Friday, March 6, 2026, 15:30–15:45, P 5
10-Second Spin Coherence and Near-Lifetime Optical Linewidths in Isotopically Engineered Diamond — •Hendrik Benjamin van Ommen1, Takashi Yamamoto1, Kai-Niklas Schymik1, René Vollmer2, and Tim Hugo Taminiau1 — 1Qutech, Delft University of Technlogy — 2Netherlands Organisation for Applied Scientific Research (TNO)
Solid-state spin defects are a promising platform for next-generation quantum technologies, but their performance is fundamentally limited by the quality of the host material. Here we present the growth and characterisation of high-purity, isotopically engineered diamond, grown along the <111> axis, hosting NV centres with excellent spin and optical properties [1]. The reduced 13C concentration results in a spin-echo coherence time of 6.8(1) ms, which is extended beyond 10 s by using up to 24000-pulse dynamical decoupling, both record times for solid-state spins. We observe a strong effect from 50 Hz mains noise, which is mitigated using a real-time feedforward scheme. While it has remained difficult to combine isotopic purification with good optical coherence, we observe a homogeneous optical linewidth of 17.8(4) MHz, near the lifetime limit. We investigate the optical coherence in further depth using a recently introduced diffusion measurement scheme [2]. These results show that our high-purity and isotopically engineered diamond is a promising candidate for future defect-centre-based quantum technologies.
[1] van Ommen et al., in preparation;
[2] van de Stolpe et al., npj Quantum Inf 11, 31 (2025)
Keywords: NV center; Diamond; Quantum Network; Isotopic Purification; Coherence