Temperature has less impact on this hBN qubit’s stability

Mechanically isolated quantum emitters in hexagonal boron nitride maintain narrow optical linewidths even at room temperature, a characteristic that sets them apart from other solid-state candidates for coherent optical control. Researchers are now focusing on addressing persistent spectral instabilities that hinder their potential; these emitters frequently exhibit fluctuations and intermittency on timescales ranging from nanoseconds to seconds. The work demonstrates detailed examination of a bright, single hBN emitter within a donor-acceptor pair framework to understand its spectral stability, a step toward realizing robust spin-photon interfaces. High-resolution spectroscopy revealed two zero-phonon lines originating from a single hexagonal boron nitride (hBN) emitter, demonstrating distinct spectral diffusion dynamics…