Slowing light propagation on photonic chips using optical cavity resonators to store light for longer time benefits both classical & quantum photonics

https://phys.org/news/2025-12-reconfigurable-platform-chip-photonic.html

"extending light storage time crucial for quantum memory... on-chip vital for robustness, deployability, manufacturability... light loss from chips' defects overcome utilizing slow-light effect on-chip (reducing velocity nearly 1,000X) extending propagation time using spectral hole burning... achieved using erbium-doped lithium niobate, exhibiting high density/ coherence... tunable/ reconfigurable repeatedly over large bandwidth without needing to fabricate new device for each different application"