Quantum interferometers are powerful tools for probing the wave-nature and
exchange statistics of indistinguishable particles. Of particular interest are
interferometers formed by the chiral, one-dimensional (1D) edge channels of the
quantum Hall effect (QHE) that guide electrons without dissipation. Using
quantum point contacts (QPCs) as beamsplitters, these 1D channels can be split
and recombined, enabling interference of charged particles. Such quantum Hall
interferometers (QHIs) can be used for studying exchange statistics of anyonic
quasiparticles. In this study we develop a robust QHI fabrication technique in
van der Waals (vdW) materials and realize a graphene-based Fabry-P\'erot (FP)
QHI. By careful heterostructure design, we are able to measure pure
Aharonov-Bohm (AB) interference effect in the integer QHE, a major technical
challenge in finite size FP interferometers. We find that integer edge modes
exhibit high visibility interference due to relatively large velocities and
long phase coherence lengths. Our QHI with tunable QPCs presents a versatile
platform for interferometer studies in vdW materials and enables future
experiments in the fractional QHE
