Materials for quantum nanophotonics

Cesare Soci, Matthew T. Sheldon, Mario Agio

Christophe Couteau

Yueyang Chen, David Sharp, Abhi Saxena +3 more

Abstract A key obstacle for all quantum information science and engineering platforms is their lack of scalability. The discovery of emergent quantum phenomena and their applications in active photonic quantum technologies have been dominated by work with single atoms, self‐assembled quantum dots, or single solid‐state defects. Unfortunately, scaling these systems to many quantum nodes remains a significant challenge. Solution‐processed quantum materials are uniquely positioned to address this challenge, but the quantum properties of these materials have remained generally inferior to those of solid‐state emitters or atoms. Additionally, systematic integration of solution‐processed materials with dielectric nanophotonic structures has been rare compared to other solid‐state systems. Recent progress in synthesis processes and nanophotonic engineering, however, has demonstrated promising results, including long coherence times of emitted single photons and deterministic integration of emitters with dielectric nano‐cavities. In this review article, these recent experiments using solution‐processed quantum materials and dielectric nanophotonic structures are discussed. The progress in non‐classical light state generation, exciton‐polaritonics for quantum simulation, and spin‐physics in these materials is discussed and an outlook for this emerging research field is provided.

David F. P. Pile

Chen-Lung Hung, A. M. Fox, Alexandra E. Boltasseva +1 more

The emerging field of quantum nanophotonics offers potential chip-scale integration of multi-functional quantum processing infrastructures. The key technological challenges lie on new material design and integration with quantum emitters. It is of fundamental importance in developing hybrid material platforms and experimental approaches to address a wide array of challenging issues that cannot be easily overcome with conventional quantum optics approaches. This special issue features 10 contributions that address various aspects of emerging quantum photonic platforms, devices and approaches that combine the advantages of several material systems to realize chip-scale quantum information processing in an efficient and robust manner.

Fabian Becker, San Kyu Kim, Kai Müller

We present nanophotonic designs for on-chip Er:Y2SiO5quantum memories with high coupling efficiency between waveguide mode and erbium ensembles, allowing AFC efficiencies up to 75 % under current material, setup and fabrication limitations.