Regensburg 2022 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 32: Focus Session: Topological Devices (joint session TT/KFM)

TT 32.3: Invited Talk

Thursday, September 8, 2022, 16:00–16:30, H10

Integration of topological insulator Josephson junctions in superconducting qubit circuits — •Tobias W. Schmitt¹, Malcolm R. Connolly^2,3, Michael Schleenvoigt¹, Chenlu Liu², Oscar Kennedy³, José M. Chávez-Garcia⁴, Anne Schmidt¹, Albert Hertel¹, Tobias Lindström⁵, Sebastian E. de Graaf⁵, Karl D. Petersson⁴, Detlev Grützmacher¹, and Peter Schüffelgen¹ — ¹Peter Grünberg Institute & Jülich-Aachen Research Alliance, Forschungszentrum Jülich — ²Blackett Laboratory, Imperial College London — ³London Centre for Nanotechnology, University College London — ⁴Center for Quantum Devices, University of Copenhagen — ⁵National Physical Laboratory

Since the prediction of topological superconductivity in hybrid devices of topological insulators (TIs) and conventional s-wave superconductors (S), S-TI-S Josephson junctions have been studied intensively in electrical transport experiments. The integration of these Josephson junctions in superconducting qubit circuits allows to investigate them via circuit quantum electrodynamic techniques, which promises novel insights into their exotic characteristics. In this talk, I will present the implementation of transmon qubits with in situ fabricated S-TI-S Josephson junctions and outline fabricational challenges. I will further show results on coherent qubit control as well as temporal quantum coherence and discuss possible limitations on qubit coherence for the first generation of TI transmon devices [1]. An outlook on qubit improvements and developements towards the detection of topological superconductivity will be given.

[1] Nano Lett. 22, 7, 2595 (2022)