Optical detection of the electron spin resonances of G centers in silicon

• URL: http://arxiv.org/abs/2605.12473v1
• Date: Tue, 12 May 2026 17:54:06 GMT
• Title: Optical detection of the electron spin resonances of G centers in silicon
• Abstract summary: We study the spin properties of ensembles of G centers under above-band-gap excitation.<n>We demonstrate coherent spin control of the defects, and characterize their spin-coherence properties.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Color centers in silicon are emerging as promising platforms for quantum technologies. Among them, the G center has attracted considerable interest owing to its bright telecom O-band single-photon emission and its optically addressable metastable electron-spin triplet state. Here we investigate the spin properties of ensembles of G centers under above-band-gap excitation. We elucidate the spin photo-dynamics giving rise to the optical detected magnetic resonance (ODMR) response of G centers. The optimal pulsed sequence for measuring the ODMR spectrum of the G defects is identified, along with the temperature and optical-power regimes maximizing the spin readout contrast. Through magneto-optical measurements, we detect a level-anticrossing of the G center electron spin states. At last, we demonstrate coherent spin control of the defects, and characterize their spin-coherence properties. Unveiling the spin degree of freedom of the G center opens new avenues for the realization of quantum memories and quantum registers based on silicon color centers.

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