Print Email Facebook Twitter Charge-sensing of a Ge/Si core/shell nanowire double quantum dot using a high-impedance superconducting resonator Title Charge-sensing of a Ge/Si core/shell nanowire double quantum dot using a high-impedance superconducting resonator Author Ungerer, J. H. (University of Basel) Chevalier Kwon, P. (University of Basel) Patlatiuk, T. (University of Basel) Ridderbos, J. (University of Basel; University of Twente) Kononov, A. (University of Basel) Sarmah, D. (University of Basel) Bakkers, E.P.A.M. (TU Delft QN/Bakkers Lab; Kavli institute of nanoscience Delft; Eindhoven University of Technology) Zumbühl, D. (University of Basel) Schönenberger, C. (University of Basel) Date 2023 Abstract Spin qubits in germanium are a promising contender for scalable quantum computers. Reading out of the spin and charge configuration of quantum dots formed in Ge/Si core/shell nanowires is typically performed by measuring the current through the nanowire. Here, we demonstrate a more versatile approach on investigating the charge configuration of these quantum dots. We employ a high-impedance, magnetic-field resilient superconducting resonator based on NbTiN and couple it to a double quantum dot in a Ge/Si nanowire. This allows us to dispersively detect charging effects, even in the regime where the nanowire is fully pinched off and no direct current is present. Furthermore, by increasing the electro-chemical potential far beyond the nanowire pinch-off, we observe indications for depleting the last hole in the quantum dot by using the second quantum dot as a charge sensor. This work opens the door for dispersive readout and future spin-photon coupling in this system. Subject charge-sensingGe/Si core/shell nanowirehigh impedanceholesNbTiNquantum dotsresonator To reference this document use: http://resolver.tudelft.nl/uuid:0a6e3a54-feff-4f2e-84db-2a6af405f59d DOI https://doi.org/10.1088/2633-4356/ace2a6 ISSN 2633-4356 Source Materials for Quantum Technology, 3 (3) Part of collection Institutional Repository Document type journal article Rights © 2023 J. H. Ungerer, P. Chevalier Kwon, T. Patlatiuk, J. Ridderbos, A. Kononov, D. Sarmah, E.P.A.M. Bakkers, D. Zumbühl, C. Schönenberger Files PDF Ungerer_2023_Mater._Quant ... 031001.pdf 2.01 MB Close viewer /islandora/object/uuid:0a6e3a54-feff-4f2e-84db-2a6af405f59d/datastream/OBJ/view