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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