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Energy shift and subharmonics induced by nonlinearity in a quantum dot system |
| Yuan Zhou(周圆)1,2, Gang Cao(曹刚)1,2, Hai-Ou Li(李海欧)1,2,†, and Guo-Ping Guo(郭国平)1,2,3 |
1 CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China;
2 CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China;
3 Origin Quantum Computing Company Limited, Hefei 230026, China |
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Abstract The presence of anticrossings induced by coupling between two states causes curvature in energy levels, yielding a nonlinearity in the quantum system. When the system is driven back and forth along the bending energy levels, subharmonic transitions and energy shifts can be observed, which would cause a significant influence as the system is applied to quantum computing. In this paper, we study a longitudinally driven singlet-triplet (ST) system in a double quantum dot (DQD) system, and illustrate the consequences of nonlinearity by driving the system close to the anticrossings. We provide a straightforward theory to quantitatively describe the energy shift and subharmonics caused by nonlinearity, and find good agreement between our theoretical result and the numerical simulation. Our results reveal the existence of nonlinearity in the vicinity of anticrossings and provide a direct way of analytically assessing its impact, which can be applied to other quantum systems without excessive labor.
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Received: 13 February 2023
Revised: 08 March 2023
Accepted manuscript online: 17 March 2023
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PACS:
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03.67.Lx
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(Quantum computation architectures and implementations)
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03.67.-a
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(Quantum information)
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68.65.Hb
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(Quantum dots (patterned in quantum wells))
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78.47.jh
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(Coherent nonlinear optical spectroscopy)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12074368, 92165207, 12034018 and 92265113), the Anhui Province Natural Science Foundation (Grant No. 2108085J03), and the USTC Tang Scholarship. |
Corresponding Authors:
Hai-Ou Li
E-mail: haiouli@ustc.edu.cn
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Cite this article:
Yuan Zhou(周圆), Gang Cao(曹刚), Hai-Ou Li(李海欧), and Guo-Ping Guo(郭国平) Energy shift and subharmonics induced by nonlinearity in a quantum dot system 2023 Chin. Phys. B 32 060303
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