  Two-dimensional systems that host one-dimensional helical states are exciting
from the perspective of scalable topological quantum computation when coupled
with a superconductor. Graphene is particularly promising for its high
electronic quality, versatility in van der Waals heterostructures and its
electron and hole-like degenerate 0$th$ Landau level. Here, we study a compact
double layer graphene SQUID (superconducting quantum interference device),
where the superconducting loop is reduced to the superconducting contacts,
connecting two parallel graphene Josephson junctions. Despite the small size of
the SQUID, it is fully tunable by independent gate control of the Fermi
energies in both layers. Furthermore, both Josephson junctions show a skewed
current phase relationship, indicating the presence of superconducting modes
with high transparency. In the quantum Hall regime we measure a well defined
conductance plateau of 2$e^2/h$ an indicative of counter propagating edge
channels in the two layers. Our work opens a way for engineering topological
superconductivity by coupling helical edge states, from graphene's
electron-hole degenerate 0$th$ Landau level via superconducting contacts.
