Bounds to electron spin qubit variability for scalable CMOS architectures
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2023
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| author | Cifuentes, Jesús D. Tanttu, Tuomo Gilbert, Will Huang, Jonathan Y. Vahapoglu, Ensar Leon, Ross C. C. Serrano, Santiago Otter, Dennis Dunmore, Daniel Mai, Philip Y. Schlattner, Frédéric Feng, MengKe Itoh, Kohei Abrosimov, Nikolay Pohl, Hans-Joachim Thewalt, Michael Laucht, Arne Yang, Chih Hwan Escott, Christopher C. Lim, Wee Han Hudson, Fay E. Rahman, Rajib Dzurak, Andrew S. Saraiva, Andre |
| author_facet | Cifuentes, Jesús D. Tanttu, Tuomo Gilbert, Will Huang, Jonathan Y. Vahapoglu, Ensar Leon, Ross C. C. Serrano, Santiago Otter, Dennis Dunmore, Daniel Mai, Philip Y. Schlattner, Frédéric Feng, MengKe Itoh, Kohei Abrosimov, Nikolay Pohl, Hans-Joachim Thewalt, Michael Laucht, Arne Yang, Chih Hwan Escott, Christopher C. Lim, Wee Han Hudson, Fay E. Rahman, Rajib Dzurak, Andrew S. Saraiva, Andre |
| contents | Spins of electrons in CMOS quantum dots combine exquisite quantum properties and scalable fabrication. In the age of quantum technology, however, the metrics that crowned Si/SiO2 as the microelectronics standard need to be reassessed with respect to their impact upon qubit performance. We chart the spin qubit variability due to the unavoidable atomic-scale roughness of the Si/SiO$_2$ interface, compiling experiments in 12 devices, and developing theoretical tools to analyse these results. Atomistic tight binding and path integral Monte Carlo methods are adapted for describing fluctuations in devices with millions of atoms by directly analysing their wavefunctions and electron paths instead of their energy spectra. We correlate the effect of roughness with the variability in qubit position, deformation, valley splitting, valley phase, spin-orbit coupling and exchange coupling. These variabilities are found to be bounded and lie within the tolerances for scalable architectures for quantum computing as long as robust control methods are incorporated. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2303_14864 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Bounds to electron spin qubit variability for scalable CMOS architectures Cifuentes, Jesús D. Tanttu, Tuomo Gilbert, Will Huang, Jonathan Y. Vahapoglu, Ensar Leon, Ross C. C. Serrano, Santiago Otter, Dennis Dunmore, Daniel Mai, Philip Y. Schlattner, Frédéric Feng, MengKe Itoh, Kohei Abrosimov, Nikolay Pohl, Hans-Joachim Thewalt, Michael Laucht, Arne Yang, Chih Hwan Escott, Christopher C. Lim, Wee Han Hudson, Fay E. Rahman, Rajib Dzurak, Andrew S. Saraiva, Andre Quantum Physics Mesoscale and Nanoscale Physics Materials Science Spins of electrons in CMOS quantum dots combine exquisite quantum properties and scalable fabrication. In the age of quantum technology, however, the metrics that crowned Si/SiO2 as the microelectronics standard need to be reassessed with respect to their impact upon qubit performance. We chart the spin qubit variability due to the unavoidable atomic-scale roughness of the Si/SiO$_2$ interface, compiling experiments in 12 devices, and developing theoretical tools to analyse these results. Atomistic tight binding and path integral Monte Carlo methods are adapted for describing fluctuations in devices with millions of atoms by directly analysing their wavefunctions and electron paths instead of their energy spectra. We correlate the effect of roughness with the variability in qubit position, deformation, valley splitting, valley phase, spin-orbit coupling and exchange coupling. These variabilities are found to be bounded and lie within the tolerances for scalable architectures for quantum computing as long as robust control methods are incorporated. |
| title | Bounds to electron spin qubit variability for scalable CMOS architectures |
| topic | Quantum Physics Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2303.14864 |