| Autor: |
Pita-Vidal, Marta, Bargerbos, Arno, Žitko, Rok, Splitthoff, Lukas J., Grünhaupt, Lukas, Wesdorp, Jaap J., Liu, Yu, Kouwenhoven, Leo P., Aguado, Ramón, van Heck, Bernard, Kou, Angela, Andersen, Christian Kraglund |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Nature Physics 19, 1110-1115 (2023) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1038/s41567-023-02071-x |
| Popis: |
Spin qubits in semiconductors are currently one of the most promising architectures for quantum computing. However, they face challenges in realizing multi-qubit interactions over extended distances. Superconducting spin qubits provide a promising alternative by encoding a qubit in the spin degree of freedom of an Andreev level. Such an Andreev spin qubit could leverage the advantages of circuit quantum electrodynamic, enabled by an intrinsic spin-supercurrent coupling. The first realization of an Andreev spin qubit encoded the qubit in the excited states of a semiconducting weak-link, leading to frequent decay out of the computational subspace. Additionally, rapid qubit manipulation was hindered by the need for indirect Raman transitions. Here, we exploit a different qubit subspace, using the spin-split doublet ground state of an electrostatically-defined quantum dot Josephson junction with large charging energy. Additionally, we use a magnetic field to enable direct spin manipulation over a frequency range of 10 GHz. Using an all-electric microwave drive we achieve Rabi frequencies exceeding 200 MHz. We furthermore embed the Andreev spin qubit in a superconducting transmon qubit, demonstrating strong coherent qubit-qubit coupling. These results are a crucial step towards a hybrid architecture that combines the beneficial aspects of both superconducting and semiconductor qubits. |
| Databáze: |
arXiv |
| Externí odkaz: |
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