Opening up the electromagnetic spectrum

https://source.wustl.edu/2022/04/opening-up-the-electromagnetic-spectrum/

"first fully integrated parity-time symmetric electronic system... can be made without the use of exotic materials, only requiring the same standard microelectronic fabrication technology used today for common integrated circuits... new technology implemented a concept with remarkable mathematical properties originating from quantum physics into an integrated circuit. It opens up a new part of the spectrum for research in the giga- to terahertz range"