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

Spin qubits in germanium are a promising contender for scalable quantum computers. Reading out of the spin and charge configuration dots formed Ge/Si core/shell nanowires is typically performed by measuring current through nanowire. Here, we demonstrate more versatile approach on investigating these dots. We employ high-impedance, magnetic-field resilient superconducting resonator based NbTiN couple it to double dot This allows us dispersively detect charging effects, even regime where nanowire fully pinched off no direct present. Furthermore, increasing electro-chemical potential far beyond pinch-off, observe indications depleting last hole using second as sensor. work opens door dispersive readout future spin-photon coupling this system.