Revealing charge-tunneling processes between a quantum dot and a superconducting island through gate sensing

Abstract

We report direct detection of charge-tunneling between a quantum dot and a superconducting island through radio-frequency gate sensing. We are able to resolve spin-dependent quasiparticle tunneling as well as two-particle tunneling involving Cooper pairs. The quantum dot can act as an RF-only sensor to characterize the superconductor addition spectrum, enabling us to access subgap states without transport. Our results provide guidance for future dispersive parity measurements of Majorana modes, which can be realized by detecting the parity-dependent tunneling between dots and islands.

arXiv comment6 pages, 4 figures, supplemental material included as ancillary file

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Cited by in corpus (13)

• Spectroscopy of spin-split Andreev levels in a quantum dot with superconducting leads
• Charge noise and overdrive errors in reflectometry-based charge, spin and Majorana qubit readout
• Parametric exploration of zero-energy modes in three-terminal InSb-Al nanowire devices
• Controllable Single Cooper Pair Splitting in Hybrid Quantum Dot Systems
• Detecting Majorana modes by readout of poisoning-induced parity flips
• Variable and orbital-dependent spin-orbit field orientations in a InSb double quantum dot characterized via dispersive gate sensing
• Radio-frequency C-V measurements with sub-attofarad sensitivity
• Visibility of noisy quantum dot-based measurements of Majorana qubits
• Readout of Majorana bound states via Landau-Zener transition
• QDarts: A Quantum Dot Array Transition Simulator for finding charge transitions in the presence of finite tunnel couplings, non-constant charging energies and sensor dots
• Subgap states in superconducting islands
• Electronic transport in double-nanowire superconducting islands with multiple terminals
• Effects of electron-electron interaction and spin-orbit coupling on Andreev pair qubits in quantum dot Josephson junctions