High-fidelity spin readout is a crucial component for quantum information processing with optically interfaced solid-state spins. Here, we propose and investigate two theoretical protocols for fast single-shot readout of cavity-coupled single T center electronic spins. For fluorescence-based readout, we selectively couple one of the T center spin-conserving transitions to a single-mode photonic cavity, exploiting the enhancement of the fluorescence emission and cyclicity. For reflection-based readout, we leverage the spin-dependent cavity reflection contrast to generate the qubit readout signal. We show that the cavity reflection approach enables high-fidelity spin readout even when the T center only has a modest cyclicity. With realistic system parameters, such as cavity quality factor $Q=2\times {10}^5$ and T-center optical linewidth $\mathrm{\Gamma }/2\pi =100\mathrm{MHz}$, we calculate a single-shot readout fidelity exceeding 99% within 10 $\mu \mathrm{s}$ for both spin readout protocols.

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• Atoms
• Quantum cavities
• Cavity resonators
• Jaynes-Cummings model
• Photon counting
• Time-resolved photoluminescence