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

Jasper Van Veen, Damaz De Jong, Lin Han, Christian Prosko, Peter Krogstrup, John D. Watson, Leo P. Kouwenhoven, Wolfgang Pfaff

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Article number174508
JournalPhysical Review B
Volume100
Issue number17
DOIs
StatePublished - Nov 8 2019
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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