Journal Article

FZJ-2022-02206

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Integration of Topological Insulator Josephson Junctions in Superconducting Qubit Circuits

Schmitt, T.FZJ* ; Connolly, M. R. ; Schleenvoigt, M.FZJ* ; Liu, C. ; Kennedy, O. ; Chávez-Garcia, J. M. ; Jalil, A. R.FZJ* ; Bennemann, B.FZJ* ; Trellenkamp, S.FZJ* ; Lentz, F.FZJ* ; Neumann, E.FZJ* ; Lindström, T. ; de Graaf, S. E. ; Berenschot, E. ; Tas, N. ; Mussler, G.FZJ* ; Petersson, K. D. ; Grützmacher, D.FZJ* ; Schüffelgen, P. (Corresponding author)FZJ*

2022
ACS Publ. Washington, DC

This record in other databases:      

Please use a persistent id in citations: http://hdl.handle.net/2128/31202  doi:10.1021/acs.nanolett.1c04055

Abstract: 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)2Te3 topological 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.

---

Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. JARA Institut Green IT (PGI-10)
3. Helmholtz - Nanofacility (HNF)

Research Program(s):

1. 5222 - Exploratory Qubits (POF4-522) (POF4-522)

Appears in the scientific report 2022

---

Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---