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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2510.26797 |
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| _version_ | 1866912678439550976 |
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| author | Wong, Yu-En Chen, Songtao |
| author_facet | Wong, Yu-En Chen, Songtao |
| contents | 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 $Q = 2\times10^5$ and T center optical linewidth $Γ/2π= 100$ MHz, we calculate a single-shot readout fidelity exceeding 99% within 8.7 $μ$s for both spin readout protocols. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_26797 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cavity-assisted single-shot T center spin readout Wong, Yu-En Chen, Songtao Quantum Physics 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 $Q = 2\times10^5$ and T center optical linewidth $Γ/2π= 100$ MHz, we calculate a single-shot readout fidelity exceeding 99% within 8.7 $μ$s for both spin readout protocols. |
| title | Cavity-assisted single-shot T center spin readout |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2510.26797 |