Cavity-assisted single-shot $\textit{T}$-center spin readout

Abstract: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 $\textit{T}$ center electronic spins. For fluorescence-based readout, we selectively couple one of the $\textit{T}$ 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 $\textit{T}$ center only has a modest cyclicity. With realistic system parameters, such as cavity quality factor $Q = 2\times10^5$ and $\textit{T}$-center optical linewidth $\Gamma/2\pi = 100$ MHz, we calculate a single-shot readout fidelity exceeding 99% within 10 $\mu$s for both spin readout protocols.

arXiv:2510.26797 [quant-ph]

(or arXiv:2510.26797v2 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2510.26797 Focus to learn more arXiv-issued DOI via DataCite

Phys. Rev. A 114, 033705 (2026)

https://doi.org/10.1103/r54v-jfbl Focus to learn more DOI(s) linking to related resources

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