Tunable, high-speed single-/ multi-wavelength laser-like emissions for optical information technologies and ultrafast signal processing

https://www.nature.com/articles/s41566-026-01855-w

"selective population transfer in multilevel quantum systems using exciton–polariton condensates (hybrid light-matter) in microcavity... condensate's energy modulated using GHz acoustic waves, shifting excitonic component's energy relative to photonic one, acting as dynamic switch forcing entire condensate population into ground state... transforms complex, multi-level system into single-level emission source on demand... spectral frequency comb with GHz repetition rates, ps-scale correlations... Floquet engineering"

Related: Two materials, one photonic chip: Unlocking a new way to generate light frequencies
https://phys.org/news/2026-08-materials-photonic-chip-generate-frequencies.html