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

doi:10.1103/PhysRevB.100.174508

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

DOI 10.1103/PhysRevB.100.174508 · Physical Review B

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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.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
InAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
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