This project targets to discover how the non-trivial multiband nature of a periodic lattice system affects bosonic correlations. The project combines quantum many-body theory research with optical experiments in nanostructured materials. Optical processing could offer low-energy-cost solutions for information technology whose global energy consumption is growing at an unsustainable rate, but advances have remained hindered partly by the weakness of matter-mediated effective interactions between photons. The key idea of the project is that the multiband lattice design may allow even weak photon-photon interactions to lead to strong effects on the system behavior. The expected breakthroughs are fundamental knowledge revealing how bosonic correlations can be enhanced by the lattice design, and the demonstration of the results in an optical system. The results can open the door for full-scale utilization of photons in all-optical classical and quantum information processing.

2022

2026