Monolithic Platform for Integrated Quantum Photonics with Hexagonal Boron Nitride

TL;DR

This paper demonstrates the fabrication of integrated quantum photonics components using hexagonal boron nitride, achieving high-quality resonators and complex circuitry, advancing scalable quantum technology platforms.

Contribution

The work introduces a monolithic IQP platform based on hBN, including high-Q resonators and complex circuitry, addressing material limitations in scalable quantum photonics.

Findings

Resonators with quality factors >4000 achieved

Fabrication of complex free-standing IQP circuitry from hBN

Potential for scalable integrated quantum technologies demonstrated

Abstract

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.