# Online data of "Charge-sensing of a Ge/Si core/shell nanowire double quantum dot using a high-impedance superconducting resonator"

# Authors

# J.H. Ungerer
# P. Chevalier Kwon
# T. Patlatiuk
# J. Ridderbos
# A. Kononov
# D. Sarmah
# E.P.A.M. Bakkers
# D. Zumbuehl
# C. Schoenenberger

# Department of Physics, University of Basel, 4054 Basel, Switzerland

# 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.

The files contain the raw and proccessed data used for the publication arXiv:2211.00763 (arxiv.org/abs/2211.00763) in ascci format.
Each file corresponds to one or two subfigures as specified by the file name.
The header of each file specifies the quantity (name and unit) in the corresponding column.
From the measured currents as reported in the dat files, a constant offset has been subtracted to obtain the figures reported in the paper.
A constant offset has been subtracted from the measured phase to obtain Delta_phi in Fig. 2 and Fig. 3.