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A defect in diamond with millisecond-scale spin relaxation time at room temperature
Preprint   Open access

A defect in diamond with millisecond-scale spin relaxation time at room temperature

Sounak Mukherjee, Anran Li, Johannes Eberle, Sean Karg, Zi-Huai Zhang, Mayer M Feldman, Yilin Chen, Mark E Turiansky, Mengen Wang, Yogendra Limbu, …
ArXiv.org
Cornell University
03/07/2026
DOI: 10.48550/arxiv.2603.07265
url
https://doi.org/10.48550/arxiv.2603.07265View
Preprint (Author's original)This preprint has not been evaluated by subject experts through peer review. Preprints may undergo extensive changes and/or become peer-reviewed journal articles. Open Access

Abstract

Spin defects in diamond are promising platforms for quantum sensing. The longest electron spin relaxation times ( T₁ ) at room temperature for solid-state defects are observed in nitrogen vacancy centers in diamond, which can reach 6.67 ms, and substitutional nitrogen ("P1 centers") in diamond, which exhibit aT₁of 2 ms. No other solid-state defect has exhibited millisecond-scale spin relaxation times at room temperature thus far. Here, we characterize the spin properties of the WAR5 defect in diamond with pulsed electron spin resonance. The observedT₁is one of the longest for solid-state spin defects: 0.97(27) ms at room temperature and 14.38(19) min at 4 K. The observed coherence time ( T₂ ) is 246(7)μ s, which can be extended to 6.49(34) ms at 4 K with dynamical decoupling. Furthermore, we demonstrate optical spin polarization with a range of wavelengths from 405 nm to 500 nm and propose potential zero-phonon line candidates.
 Physics - Materials Science Physics - Quantum Physics

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