期刊
PHYSICAL REVIEW B
卷 106, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.106.075417
关键词
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资金
- Key -Area Research and Development Program of GuangDong Province [2018B030326001, 11874312]
- Research Grants Council of Hong Kong [11303617, 11304018, 11304920]
- Guangdong Inno- vative and Entrepreneurial Research Team Program [2016ZT06D348]
This study theoretically demonstrates the existence of sweet spots in singlet-triplet qubit systems and shows that, under realistic noise conditions, these sweet spots can achieve high-fidelity two-qubit operations.
The search for a sweet spot, the locus in qubit parameters where quantum control is first-order insensitive to noises, is key to achieve high-fidelity quantum gates. Efforts to search for such a sweet spot in conventional double-quantum-dot singlet-triplet qubits where each dot hosts one electron ( two-electron singlet-triplet qubit ), especially for two-qubit operations, have been unsuccessful. Here we consider singlet-triplet qubits allowing each dot to host more than one electron, with a total of four electrons in the double quantum dots ( four-electron singlet-triplet qubit ). We theoretically demonstrate, using configuration interaction calculations, that sweet spots appear in this coupled qubit system. We further demonstrate that, under realistic charge noise and hyperfine noise, a two-qubit operation at the proposed sweet spot could offer gate fidelities (-99%) that are higher than the conventional two-electron singlet-triplet qubit system (-90%). Our results should facilitate realization of high-fidelity two-qubit gates in singlet-triplet qubit systems.
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