Linking classical microwave electrical circuits to the optical telecommunication band is at the core of modern communication. Future quantum information networks will require coherent microwave-to-optical conversion to link electronic quantum processors and memories via low-loss optical telecommunication networks. Efficient conversion can be achieved with electro-optical modulators operating at the single microwave photon level.

In the current issue of Optica we present a comparably high bandwidth converter operating at room temperature:
https://www.osapublishing.org/optica/abstract.cfm?uri=optica-3-6-597