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

TY - JOUR

T1 - Revealing charge-tunneling processes between a quantum dot and a superconducting island through gate sensing

AU - van Veen, Jasper

AU - de Jong, Damaz

AU - Han, Lin

AU - Prosko, Christian

AU - Krogstrup, Peter

AU - Watson, John D.

AU - Kouwenhoven, Leo P.

AU - Pfaff, Wolfgang

N1 - [Qdev]

PY - 2019/11/8

Y1 - 2019/11/8

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevB.100.174508

DO - 10.1103/PhysRevB.100.174508

M3 - Journal article

SN - 2469-9950

VL - 100

JO - Physical Review B

JF - Physical Review B

IS - 17

M1 - 174508

ER -