  Integrated quantum photonics, with potential applications in quantum
information processing, relies on the integration of quantum emitters into
on-chip photonic circuits. Hexagonal boron nitride (hBN) is recognized as a
material that is compatible with such implementations, owing to its relatively
high refractive index and low losses in the visible range, together with
advantageous fabrication techniques. Here, we combine hBN waveguide
nanofabrication with the recently demonstrated local generation of quantum
emitters using electron irradiation to realize a fully top-down elementary
quantum photonic circuit in this material, operating at room temperature. This
proof of principle constitutes a first step towards deterministic quantum
photonic circuits in hBN.
