DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2022 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

QI: Fachverband Quanteninformation

QI 13: Implementations: Superconducting Qubits

QI 13.9: Talk

Friday, September 9, 2022, 12:00–12:15, H8

Magnetic field dependence of the quasiparticle parity lifetime in 3D transmons with thin-film AlAlOxAl Josephson junctions — •Jonas Krause1, Lucas Jannsen1, Christian Dickel1, Elmore Vaal1, Michel Vielmetter1, Jurek Frey2, Felix Motzoi3, Shai Machness2, Kelvin Loh4, Michiel Adriaan Rol4, Gianluigi Catelani5, and Yoichi Ando11Physics Institute II, University of Cologne — 2Quantum Computing Analytics (PGI 12), Forschungszentrum Jülich — 3Institute of Quantum Control (PGI-8), Forschungszentrum Jülich — 4Orange Quantum Systems — 5JARA Institute for Quantum Information (PGI-11), Forschungszentrum Jülich

Magnetic-field resilient superconducting circuits enable quantum sensing applications, hybrid quantum computing architectures, as well as studying flux noise and quasiparticle loss. Placing a thin-film aluminum transmon in a 3D copper cavity, we can measure its quasiparticle parity lifetime over a large range of magnetic fields, with in-plane fields approaching 1T. The magnetic field reduces the Josephson Energy EJ, while the charging energy EC is virtually unaffected. The transmon exhibits a parity-dependent frequency splitting. We are working on optimal control techniques for fast parity-selective gates which together with single-shot readout allow measuring the parity lifetime. The magnetic-field dependence of the parity lifetime is of interest for future topological qubits, which rely on combining superconductors with magnetic fields; additionally, it could improve the understanding quasiparticle loss in conventional superconducting qubits.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2022 > Regensburg