Strong tunable coupling between two distant superconducting spin qubits
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866917658803306496 |
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| author | Pita-Vidal, Marta Wesdorp, Jaap J. Splitthoff, Lukas J. Bargerbos, Arno Liu, Yu Kouwenhoven, Leo P. Andersen, Christian Kraglund |
| author_facet | Pita-Vidal, Marta Wesdorp, Jaap J. Splitthoff, Lukas J. Bargerbos, Arno Liu, Yu Kouwenhoven, Leo P. Andersen, Christian Kraglund |
| contents | Superconducting (or Andreev) spin qubits have recently emerged as an alternative qubit platform with realizations in semiconductor-superconductor hybrid nanowires. In these qubits, the spin degree of freedom is intrinsically coupled to the supercurrent across a Josephson junction via the spin-orbit interaction, which facilitates fast, high-fidelity spin readout using circuit quantum electrodynamics techniques. Moreover, this spin-supercurrent coupling has been predicted to facilitate inductive multi-qubit coupling. In this work, we demonstrate a strong supercurrent-mediated coupling between two distant Andreev spin qubits. This qubit-qubit interaction is of the longitudinal type and we show that it is both gate- and flux-tunable up to a coupling strength of 178 MHz. Finally, we find that the coupling can be switched off in-situ using a magnetic flux. Our results demonstrate that integrating microscopic spin states into a superconducting qubit architecture can combine the advantages of both semiconductors and superconducting circuits and pave the way to fast two-qubit gates between remote spins. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_15654 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Strong tunable coupling between two distant superconducting spin qubits Pita-Vidal, Marta Wesdorp, Jaap J. Splitthoff, Lukas J. Bargerbos, Arno Liu, Yu Kouwenhoven, Leo P. Andersen, Christian Kraglund Quantum Physics Mesoscale and Nanoscale Physics Superconductivity Superconducting (or Andreev) spin qubits have recently emerged as an alternative qubit platform with realizations in semiconductor-superconductor hybrid nanowires. In these qubits, the spin degree of freedom is intrinsically coupled to the supercurrent across a Josephson junction via the spin-orbit interaction, which facilitates fast, high-fidelity spin readout using circuit quantum electrodynamics techniques. Moreover, this spin-supercurrent coupling has been predicted to facilitate inductive multi-qubit coupling. In this work, we demonstrate a strong supercurrent-mediated coupling between two distant Andreev spin qubits. This qubit-qubit interaction is of the longitudinal type and we show that it is both gate- and flux-tunable up to a coupling strength of 178 MHz. Finally, we find that the coupling can be switched off in-situ using a magnetic flux. Our results demonstrate that integrating microscopic spin states into a superconducting qubit architecture can combine the advantages of both semiconductors and superconducting circuits and pave the way to fast two-qubit gates between remote spins. |
| title | Strong tunable coupling between two distant superconducting spin qubits |
| topic | Quantum Physics Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2307.15654 |