Dispersive sensing in hybrid InAs/Al nanowires

Abstract

Dispersive charge sensing is realized in hybrid semiconductor-superconductor nanowires in gate-defined single- and double-island device geometries. Signal-to-noise ratios (SNRs) were measured both in the frequency and time domain. Frequency-domain measurements were carried out as a function of frequency and power and yield a charge sensitivity of $1\times 10^{-3}e/\sqrt{\mathrm{Hz}}$ for an 11 MHz measurement bandwidth. Time-domain measurements yield SNR > 1 for 20 $\mu$s integration time. At zero magnetic field, photon-assisted tunneling was detected dispersively in a double-island geometry, indicating coherent hybridization of the two superconducting islands. At an axial magnetic field of 0.6 T, subgap states are detected dispersively, demonstrating the suitability of the method for sensing in the topological regime.

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Cited by in corpus (9)

• Large dispersive interaction between a CMOS double quantum dot and microwave photons
• Charge noise and overdrive errors in reflectometry-based charge, spin and Majorana qubit readout
• Rapid microwave-only characterization and readout of quantum dots using multiplexed gigahertz-frequency resonators
• Controllable Single Cooper Pair Splitting in Hybrid Quantum Dot Systems
• Variable and orbital-dependent spin-orbit field orientations in a InSb double quantum dot characterized via dispersive gate sensing
• Majorana modes in quantum dots coupled via a floating superconducting island
• Majorana signatures in charge transport through a topological superconducting double-island system
• Multiterminal transport spectroscopy of subgap states in Coulomb-blockaded superconductors
• Electronic transport in double-nanowire superconducting islands with multiple terminals