Integration of Topological Insulator Josephson Junctions in Superconducting Qubit Circuits

Tobias W. Schmitt, Malcolm R. Connolly, Michael Schleenvoigt, Chenlu Liu, Oscar Kennedy, José M. Chávez-Garcia, Abdur R. Jalil, Benjamin Bennemann, Stefan Trellenkamp, Florian Lentz, Elmar Neumann, Tobias Lindström, Sebastian E. De Graaf, Erwin Berenschot, Niels Tas, Gregor Mussler, Karl D. Petersson, Detlev Grützmacher, Peter Schüffelgen*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)
22 Downloads (Pure)


The integration of semiconductor Josephson junctions (JJs) in superconducting quantum circuits provides a versatile platform for hybrid qubits and offers a powerful way to probe exotic quasiparticle excitations. Recent proposals for using circuit quantum electrodynamics (cQED) to detect topological superconductivity motivate the integration of novel topological materials in such circuits. Here, we report on the realization of superconducting transmon qubits implemented with (Bi0.06Sb0.94)2Te3topological insulator (TI) JJs using ultrahigh vacuum fabrication techniques. Microwave losses on our substrates, which host monolithically integrated hardmasks used for the selective area growth of TI nanostructures, imply microsecond limits to relaxation times and, thus, their compatibility with strong-coupling cQED. We use the cavity-qubit interaction to show that the Josephson energy of TI-based transmons scales with their JJ dimensions and demonstrate qubit control as well as temporal quantum coherence. Our results pave the way for advanced investigations of topological materials in both novel Josephson and topological qubits.

Original languageEnglish
Pages (from-to)2595-2602
Number of pages8
JournalNano letters
Issue number7
Publication statusPublished - 13 Apr 2022


  • Josephson junctions
  • selective area growth
  • stencil lithography
  • superconducting qubits
  • topological insulators
  • 22/4 OA procedure


Dive into the research topics of 'Integration of Topological Insulator Josephson Junctions in Superconducting Qubit Circuits'. Together they form a unique fingerprint.

Cite this