Gate-Tunable Field-Compatible Fluxonium
M. Pita-Vidal (TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft)
Arno Bargerbos (TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft)
C. Yang (Microsoft Quantum Lab Delft)
D. J. Van Woerkom (Microsoft Quantum Lab Delft)
W. Pfaff (University of Illinois at Urbana Champaign)
N Haider (TNO, TU Delft - QuTech Advanced Research Centre, TU Delft - BUS/TNO STAFF)
Peter Krogstrup (University of Copenhagen)
Leo Kouwenhoven (TU Delft - QN/Kouwenhoven Lab, TU Delft - QuTech Advanced Research Centre, Microsoft Quantum Lab Delft)
G De Lange (Microsoft Quantum Lab Delft)
A. Kou (University of Illinois at Urbana Champaign)
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Abstract
Hybrid superconducting circuits, which integrate nonsuperconducting elements into a circuit quantum electrodynamics (cQED) architecture, expand the possible applications of cQED. Building hybrid circuits that work in large magnetic fields presents even further possibilities, such as the probing of spin-polarized Andreev bound states and the investigation of topological superconductivity. Here we present a magnetic-field compatible hybrid fluxonium with an electrostatically tuned semiconducting nanowire as its nonlinear element. We operate the fluxonium in magnetic fields up to 1 T and use it to observe the f0-Josephson effect. This combination of gate tunability and field compatibility opens avenues for the control of spin-polarized phenomena using superconducting circuits and enables the use of the fluxonium as a readout device for topological qubits.
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