Freiburg 2019 – scientific programme
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FM: Fall Meeting
FM 19: Topology: Majoranas
FM 19.6: Talk
Monday, September 23, 2019, 18:00–18:15, 1199
Integration of topological Josephson junctions into superconducting quantum circuits — •Tobias W. Schmitt1,2, Malcolm R. Connolly3, Michael Schleenvoigt2, Abdur R. Jalil2, Dennis Heffels2, Chenlu Liu3, Stefan Trellenkamp2, Florian Lentz2, Elmar Neumann2, Gregor Mussler2, Peter Schüffelgen2, Karl D. Petersson4, and Detlev Grützmacher2 — 1JARA-FIT Institute Green IT, RWTH Aachen University — 2Peter Grünberg Institute, Forschungszentrum Jülich — 3Imperial College, London — 4Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
The interface of a 3D topological insulator (3D TI) and an s-wave superconductor (S) is predicted to host elusive Majorana modes. In lateral topological S-TI-S Josephson junctions Majorana bound states (MBS) are assumed to contribute to transport. Due to superimposed conventional Andreev bound states (ABS), observation of unambiguous Majorana signatures in transport measurements is hindered. In order to differentiate MBS from ABS signatures, it has been proposed to integrate S-TI-S junctions into superconducting qubits [1]. A technical challenge in this fabrication process is the protection of the TI surface from degradation at ambient conditions while maintaining a pristine interface to the s-wave superconductor. In this contribution, I will report on recent progress in the integration of in situ fabricated S-TI-S junctions in superconducting quantum circuits and present preliminary results on these devices. [1] arXiv:1902.07229