Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session K72: Entanglement and Entropy for Multiparty Quantum Systems
3:00 PM–5:48 PM,
Tuesday, March 7, 2023
Room: Room 406
Sponsoring
Unit:
DQI
Chair: Tony Jin, University of Chicago
Abstract: K72.00009 : Microwave spectroscopy of interacting Andreev spins*
4:36 PM–4:48 PM
Presenter:
Jaap J Wesdorp
(Qutech, Delft University of Technology)
Authors:
Jaap J Wesdorp
(Qutech, Delft University of Technology)
Francisco Matute-Cañadas
(Universidad Autónoma de Madrid)
Arjen Vaartjes
(Qutech, Delft university of Technology)
Lukas Gruenhaupt
(Qutech, Delft University of Technology)
Tom Laeven
(Microsoft Quantum Lab Delft)
Sebastiaan Roelofs
(Qutech, Delft University of Technology)
Lukas Johannes Splitthoff
(Qutech, Delft University of Technology)
Marta Pita-Vidal
(Qutech, Delft University of Technology)
Arno Bargerbos
(Qutech, Delft University of Technology)
David J Van Woerkom
(Microsoft Quantum Lab Delft)
Peter Krogstrup
(Niels Bohr Institute, University of Copenhagen)
Leo P Kouwenhoven
(Qutech, Delft University of Technology)
Christian K Andersen
(Qutech, Delft University of Technology)
Alfredo Levy Yeyati
(Universidad Autónoma de Madrid)
Bernard Van Heck
(Leiden University)
Gijs de Lange
(Microsoft Quantum Lab Delft)
can be occupied with spinful quasiparticles. Microwave experiments using superconducting circuits
with InAs/Al nanowire Josephson junctions have recently enabled probing and coherent manipulation
of Andreev states but have remained limited to zero or small fields. Here we use a fluxtunable
superconducting circuit in external magnetic fields up to 1T to perform spectroscopy of
spin-polarized Andreev states up to ~250 mT, beyond which the spectrum becomes gapless. We
identify singlet and triplet states of two quasiparticles occupying different Andreev states through
their dispersion in magnetic field. These states are split by exchange interaction and couple via spinorbit
coupling, analogously to two-electron states in quantum dots. We also show that the magnetic
field allows to drive a direct spin-flip transition of a single quasiparticle trapped in the junction.
Finally, we measure a gate- and field-dependent anomalous phase shift of the Andreev spectrum,
of magnitude up to approximately 0.7π . Our observations demonstrate new ways to manipulate
Andreev states in a magnetic field and reveal spin-polarized triplet states that carry supercurrent.
*is supported by funding from the Dutch Research Council (NWO) and the Microsoft Quantum initiative
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