The scaling up of semiconductor quantum dots to two-dimensional arrays is attracting considerable interest for use in large-scale spin-based quantum computation. One of the fundamental technologies to be realized in the two-dimensional arrays of quantum dots is the coherent manipulations of individual electron spins. In this work, we report on a micromagnet design that generates stray magnetic fields that can be used for spin manipulations via electric dipole spin resonance in a 2 × 2 quantum dot array. We consider a micromagnet with lower symmetry than that typically used in the case of linear dot arrays and optimize its dimensions to produce a maximum stray field gradient while maintaining Zeeman splitting differences sufficiently large among the four dots to permit qubit addressability. The optimized field gradient is around 60% smaller than that used in linear dot arrays, but it is still large enough for spin manipulation experiments. Our result represents an important step toward the experimental realization of spin-qubit operations in two-dimensional arrays of quantum dots.
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Micromagnet design for addressable fast spin manipulations in a 2 × 2 quantum dot array
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14 December 2022
Research Article|
December 08 2022
Micromagnet design for addressable fast spin manipulations in a 2 × 2 quantum dot array
Shungo Nakamura;
Shungo Nakamura
(Investigation, Software, Writing – original draft)
1
Sanken, Osaka University
, Osaka 567-0047, Japan
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Haruki Kiyama
;
Haruki Kiyama
a)
(Conceptualization, Investigation, Software, Supervision, Writing – original draft, Writing – review & editing)
1
Sanken, Osaka University
, Osaka 567-0047, Japan
2
Graduate School and Faculty of Information Science and Electrical Engineering, Kyushu University
, Fukuoka 819-0395, Japan
a)Author to whom correspondence should be addressed: kiyama@ed.kyushu-u.ac.jp
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Akira Oiwa
Akira Oiwa
(Funding acquisition, Supervision, Writing – original draft, Writing – review & editing)
1
Sanken, Osaka University
, Osaka 567-0047, Japan
3
Center for Quantum Information and Quantum Biology (QIQB), Osaka University
, Osaka 565-0871, Japan
4
Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University
, Osaka 560-8531, Japan
5
Spintronics Research Network Division, Institute for Open and Transdisciplinary Research Initiatives, Osaka University
, Osaka 565-0871, Japan
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a)Author to whom correspondence should be addressed: kiyama@ed.kyushu-u.ac.jp
Journal of Applied Physics 132, 224301 (2022)
Article history
Received:
February 20 2022
Accepted:
October 20 2022
Citation
Shungo Nakamura, Haruki Kiyama, Akira Oiwa; Micromagnet design for addressable fast spin manipulations in a 2 × 2 quantum dot array. Journal of Applied Physics 14 December 2022; 132 (22): 224301. https://doi.org/10.1063/5.0088840
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