Tomography of entangling two-qubit logic operations in exchange-coupled donor electron spin qubits
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866911159949459456 |
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| author | Stemp, Holly G. Asaad, Serwan van Blankenstein, Mark R. Vaartjes, Arjen Johnson, Mark A. I. Mądzik, Mateusz T. Heskes, Amber J. A. Firgau, Hannes R. Su, Rocky Y. Yang, Chih Hwan Laucht, Arne Ostrove, Corey I. Rudinger, Kenneth M. Young, Kevin Blume-Kohout, Robin 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. Asaad, Serwan van Blankenstein, Mark R. Vaartjes, Arjen Johnson, Mark A. I. Mądzik, Mateusz T. Heskes, Amber J. A. Firgau, Hannes R. Su, Rocky Y. Yang, Chih Hwan Laucht, Arne Ostrove, Corey I. Rudinger, Kenneth M. Young, Kevin Blume-Kohout, Robin Hudson, Fay E. Dzurak, Andrew S. Itoh, Kohei M. Jakob, Alexander M. Johnson, Brett C. Jamieson, David N. Morello, Andrea |
| contents | Scalable quantum processors require high-fidelity universal quantum logic operations in a manufacturable physical platform. Donors in silicon provide atomic size, excellent quantum coherence and compatibility with standard semiconductor processing, but no entanglement between donor-bound electron spins has been demonstrated to date. Here we present the experimental demonstration and tomography of universal 1- and 2-qubit gates in a system of two weakly exchange-coupled electrons, bound to single phosphorus donors introduced in silicon by ion implantation. We surprisingly observe that the exchange interaction has no effect on the qubit coherence. We quantify the fidelity of the quantum operations using gate set tomography (GST), and we use the universal gate set to create entangled Bell states of the electrons spins, with fidelity ~ 93%, and concurrence 0.91 +/- 0.08. These results form the necessary basis for scaling up donor-based quantum computers. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_15463 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Tomography of entangling two-qubit logic operations in exchange-coupled donor electron spin qubits Stemp, Holly G. Asaad, Serwan van Blankenstein, Mark R. Vaartjes, Arjen Johnson, Mark A. I. Mądzik, Mateusz T. Heskes, Amber J. A. Firgau, Hannes R. Su, Rocky Y. Yang, Chih Hwan Laucht, Arne Ostrove, Corey I. Rudinger, Kenneth M. Young, Kevin Blume-Kohout, Robin 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 Scalable quantum processors require high-fidelity universal quantum logic operations in a manufacturable physical platform. Donors in silicon provide atomic size, excellent quantum coherence and compatibility with standard semiconductor processing, but no entanglement between donor-bound electron spins has been demonstrated to date. Here we present the experimental demonstration and tomography of universal 1- and 2-qubit gates in a system of two weakly exchange-coupled electrons, bound to single phosphorus donors introduced in silicon by ion implantation. We surprisingly observe that the exchange interaction has no effect on the qubit coherence. We quantify the fidelity of the quantum operations using gate set tomography (GST), and we use the universal gate set to create entangled Bell states of the electrons spins, with fidelity ~ 93%, and concurrence 0.91 +/- 0.08. These results form the necessary basis for scaling up donor-based quantum computers. |
| title | Tomography of entangling two-qubit logic operations in exchange-coupled donor electron spin qubits |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2309.15463 |