This paper reports on the quantum coherent control under ambient conditions of a single-photon-emitting defect spin in hexagonal boron nitride (hBN). The carbon-related defect exhibits a spin-triplet electronic ground-state manifold, with spin coherence primarily governed by coupling to a few proximal nuclei. Decoupling protocols prolong this coherence, introducing a new platform for room-temperature spin qubits coupled to quantum registers or sensors.

Hannah L. Stern, Carmem M. Gilardoni, Qiushi Gu, Simone Eizagirre Barker, Oliver F. J. Powell, Xiaoxi Deng, Stephanie A. Fraser, Louis Follet, Chi Li, Andrew J. Ramsay, Hark Hoe Tan, Igor Aharonovich, Mete Atatüre