Strong tunable coupling between two distant superconducting spin qubits

• URL: http://arxiv.org/abs/2307.15654v1
• Date: Fri, 28 Jul 2023 16:30:48 GMT
• Title: Strong tunable coupling between two distant superconducting spin qubits
• Authors: Marta Pita-Vidal, Jaap J. Wesdorp, Lukas J. Splitthoff, Arno Bargerbos, Yu Liu, Leo P. Kouwenhoven, Christian Kraglund Andersen
• Abstract summary: Superconducting (or Andreev) spin qubits have emerged as an alternative qubit platform. In this work, we demonstrate a strong supercurrent-mediated coupling between two distant Andreev spin qubits.
• Score: 3.2422448552678254
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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