  Integrated quantum photonics (IQP) provides a path to practical, scalable
quantum computation, communications and information processing. Realization of
an IQP platform requires integration of quantum emitters with high quality
photonic circuits. However, the range of materials for monolithic platforms is
limited by the simultaneous need for a high-quality single photon source, high
optical performance and availability of scalable nanofabrication techniques.
Here we demonstrate the fabrication of IQP components from the recently emerged
quantum material hexagonal boron nitride (hBN), including tapered waveguides,
microdisks, and 1D and 2D photonic crystal cavities. Resonators with quality
factors greater than 4000 are achieved, and we engineer proof-of-principle
complex, free-standing IQP circuitry fabricated from single crystal hBN. Our
results show the potential of hBN for scalable integrated quantum technologies.
