TY  - JOUR
AU  - Schmitt, Tobias
AU  - Connolly, Malcolm R.
AU  - Schleenvoigt, Michael
AU  - Liu, Chenlu
AU  - Kennedy, Oscar
AU  - Chávez-Garcia, José M.
AU  - Jalil, Abdur R.
AU  - Bennemann, Benjamin
AU  - Trellenkamp, Stefan
AU  - Lentz, Florian
AU  - Neumann, Elmar
AU  - Lindström, Tobias
AU  - de Graaf, Sebastian E.
AU  - Berenschot, Erwin
AU  - Tas, Niels
AU  - Mussler, Gregor
AU  - Petersson, Karl D.
AU  - Grützmacher, Detlev
AU  - Schüffelgen, Peter
TI  - Integration of Topological Insulator Josephson Junctions in Superconducting Qubit Circuits
JO  - Nano letters
VL  - 22
IS  - 7
SN  - 1530-6984
CY  - Washington, DC
PB  - ACS Publ.
M1  - FZJ-2022-02206
SP  - 2595 - 2602
PY  - 2022
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:35235321
UR  - <Go to ISI:>//WOS:000812795200001
DO  - DOI:10.1021/acs.nanolett.1c04055
UR  - https://juser.fz-juelich.de/record/907777
ER  -