Even for moderate quantum yields, dielectric cavities could be designed such that the single photon extraction into the guided mode can reach unity. The results, published in Nature Communications under the title “Integration of single photon emitters in 2D layered materials with a silicon nitride photonic chip” provide a crucial step in fundamental quantum photonics and 2D materials research.
Photonic integrated circuits (PICs) enable the miniaturization of complex quantum optical circuits connecting large numbers of photonic devices with optimized insertion losses and phase stability. A central building block for such an integrated quantum circuit is a single photon emitter (SPE), and a variety of material systems have been investigated to create such on-chip SPEs. 2D-based SPEs have some unique properties that make them particularly appealing for integration with PICs.