Shifting colors for on-chip photonics: highly efficient GHz light conversion could be used in next generation quantum computers and networks
https://www.seas.harvard.edu/news/2021/11/shifting-colors-chip-photonics
"easily controlled, using continuous and single-tone microwaves... two types of on-chip frequency shifter — one that can covert one color to another, using a shift of a few dozen gigahertz, and another that can cascade multiple shifts, a shift of more than 100 gigahertz. Each device is built on the lithium niobate platform... using only a single, 30-gigahertz microwave signal... Previous attempts to shift frequencies by amounts larger than 100 gigahertz have been very hard and expensive"
Related: Molecular device turns infrared into visible light
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