  We demonstrate dispersive readout of individual charge states in a
gate-defined few-electron quantum dot in bilayer graphene. We employ a radio
frequency reflectometry circuit, where an LC resonator with a resonance
frequency close to 280 MHz is directly coupled to an ohmic contact of the
quantum dot device. The detection scheme based on changes in the quantum
capacitance operates over a wide gate-voltage range and allows to probe excited
states down to the single-electron regime. Crucially, the presented sensing
technique avoids the use of an additional, capacitively coupled quantum device
such as a quantum point contact or single electron transistor, making
dispersive sensing particularly interesting for gate-defined graphene quantum
dots.
