Photoelectric detection of single spins in diamond by optically controlled discharge of long-lived trap states
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911239563640832 |
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| author | Ulibarri, A. C. McCloskey, D. J. Wang, D. Dontschuk, N. Martin, A. M. Wood, A. A. |
| author_facet | Ulibarri, A. C. McCloskey, D. J. Wang, D. Dontschuk, N. Martin, A. M. Wood, A. A. |
| contents | Electrical detection methods for solid-state spins are attractive for quantum technologies, being readily chip-scalable and not subject to the small photon budgets of single emitters. However, realising electrical spin readout in wide-bandgap materials with similar fidelity and bandwidth to optical approaches remains challenging. Here, we introduce a photoelectrical spin readout scheme that detects spin information stored long-term as trapped electrical charges. Using nitrogen-vacancy (NV) centres in diamond as a model system, spin-dependent photoionisation generates charge carriers that are stored in long-lived trap states at a diamond-metal Schottky junction. On-demand illumination of the junction under electrical bias releases stored charge, yielding a photocurrent transient proportional to the amount of trapped charge and hence spin state. Spin readout after coherent control of single NVs is demonstrated using charge readout in a protocol we call charge-capture detected magnetic resonance (CCDMR), and we use charge-based imaging to identify charge carrier generation and trapping processes. Our results establish CCDMR as a new technique for solid-state spin qubit readout, combining attaractive features of electrical detection with the stability of long-lived charge traps in wide-bandgap materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_25619 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Photoelectric detection of single spins in diamond by optically controlled discharge of long-lived trap states Ulibarri, A. C. McCloskey, D. J. Wang, D. Dontschuk, N. Martin, A. M. Wood, A. A. Quantum Physics Electrical detection methods for solid-state spins are attractive for quantum technologies, being readily chip-scalable and not subject to the small photon budgets of single emitters. However, realising electrical spin readout in wide-bandgap materials with similar fidelity and bandwidth to optical approaches remains challenging. Here, we introduce a photoelectrical spin readout scheme that detects spin information stored long-term as trapped electrical charges. Using nitrogen-vacancy (NV) centres in diamond as a model system, spin-dependent photoionisation generates charge carriers that are stored in long-lived trap states at a diamond-metal Schottky junction. On-demand illumination of the junction under electrical bias releases stored charge, yielding a photocurrent transient proportional to the amount of trapped charge and hence spin state. Spin readout after coherent control of single NVs is demonstrated using charge readout in a protocol we call charge-capture detected magnetic resonance (CCDMR), and we use charge-based imaging to identify charge carrier generation and trapping processes. Our results establish CCDMR as a new technique for solid-state spin qubit readout, combining attaractive features of electrical detection with the stability of long-lived charge traps in wide-bandgap materials. |
| title | Photoelectric detection of single spins in diamond by optically controlled discharge of long-lived trap states |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2510.25619 |