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We combine electrostatic and magnetic confinement to define a quantum dot in bilayer graphene. The employed geometry couples n -doped reservoirs to a p -doped dot. At magnetic field values around $B=2$ T, Coulomb blockade is observed. This demonstrates that the coupling of the copropagating modes at the p – n interface is weak enough to form a tunnel barrier, facilitating transport of single charge carriers onto the dot. This result may be of use for quantum Hall interferometry experiments.