Electron readout contrast enhancement in the parallel nuclear regime of an exchange-coupled donor spin qubit system
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910023423098880 |
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| author | Stemp, Holly G. van Blankenstein, Mark R. Wilhelm, Benjamin Asaad, Serwan Mądzik, Mateusz T. Laucht, Arne Hudson, Fay E. Dzurak, Andrew S. Itoh, Kohei M. Jakob, Alexander M. Johnson, Brett C. Jamieson, David N. Morello, Andrea |
| author_facet | Stemp, Holly G. van Blankenstein, Mark R. Wilhelm, Benjamin Asaad, Serwan Mądzik, Mateusz T. Laucht, Arne Hudson, Fay E. Dzurak, Andrew S. Itoh, Kohei M. Jakob, Alexander M. Johnson, Brett C. Jamieson, David N. Morello, Andrea |
| contents | Recent experiments on donor-based spin qubits in silicon have leveraged the exchange interaction between electrons bound to separate donor nuclei to perform two-qubit operations. A consistently observed yet unexplained phenomenon in such systems is the significant increase in electron readout contrast, measured via Elzerman-style readout to a single-electron transistor (SET) island, when the donor nuclei are initialized in a parallel spin orientation compared to an anti-parallel orientation. In this work, we present a detailed analysis of the exchange-coupled donor system in the parallel nuclear regime and propose a physical mechanism for this effect. We attribute the enhanced readout contrast to an additional electron tunneling event to the SET during a single read period, when the donor nuclei are aligned in a parallel spin configuration. These insights inform strategies for improving electron readout fidelity in these systems and contribute to a more complete understanding of spin-dependent tunnelling processes in donor-based qubit architectures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_14426 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Electron readout contrast enhancement in the parallel nuclear regime of an exchange-coupled donor spin qubit system Stemp, Holly G. van Blankenstein, Mark R. Wilhelm, Benjamin Asaad, Serwan Mądzik, Mateusz T. Laucht, Arne Hudson, Fay E. Dzurak, Andrew S. Itoh, Kohei M. Jakob, Alexander M. Johnson, Brett C. Jamieson, David N. Morello, Andrea Quantum Physics Mesoscale and Nanoscale Physics Recent experiments on donor-based spin qubits in silicon have leveraged the exchange interaction between electrons bound to separate donor nuclei to perform two-qubit operations. A consistently observed yet unexplained phenomenon in such systems is the significant increase in electron readout contrast, measured via Elzerman-style readout to a single-electron transistor (SET) island, when the donor nuclei are initialized in a parallel spin orientation compared to an anti-parallel orientation. In this work, we present a detailed analysis of the exchange-coupled donor system in the parallel nuclear regime and propose a physical mechanism for this effect. We attribute the enhanced readout contrast to an additional electron tunneling event to the SET during a single read period, when the donor nuclei are aligned in a parallel spin configuration. These insights inform strategies for improving electron readout fidelity in these systems and contribute to a more complete understanding of spin-dependent tunnelling processes in donor-based qubit architectures. |
| title | Electron readout contrast enhancement in the parallel nuclear regime of an exchange-coupled donor spin qubit system |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2602.14426 |