Perfect impedance matching unlocks sensitive radio-frequency reflectometry in 2D material quantum dots
Researchers developed RF reflectometry for high-resistance quantum dots in bilayer graphene and molybdenum disulfide using a tunable strontium titanate varactor. By tuning the varactor voltage, they achieved nearly perfect impedance matching to the 50 $\Omega$ circuit, allowing clear observation of Coulomb oscillations. This enables highly sensitive charge detection for single-electron transitions.