  We present measurements of quantized conductance in electrostatically induced
quantum point contacts in bilayer graphene. The application of a perpendicular
magnetic field leads to an intricate pattern of lifted and restored
degeneracies with increasing field: at zero magnetic field the degeneracy of
quantized one-dimensional subbands is four, because of a twofold spin and a
twofold valley degeneracy. By switching on the magnetic field, the valley
degeneracy is lifted. Due to the Berry curvature states from different valleys
split linearly in magnetic field. In the quantum Hall regime fourfold
degenerate conductance plateaus reemerge. During the adiabatic transition to
the quantum Hall regime, levels from one valley shift by two in quantum number
with respect to the other valley, forming an interweaving pattern that can be
reproduced by numerical calculations.
