The path to a quantum network: Erbium dopants stimulated to emit single photons

https://phys.org/news/2023-06-path-quantum-network-erbium-dopants.html

"excited individual erbium atoms emit individual photons... doped rare earth atoms into silicon crystal lattice at specific positions gives erbium excellent optics, emit wavelength 1,536 nm... quantum information transmitted over long distances... few micrometers and contained only few dozen erbium atoms, coupled to optical fiber allowed laser enter nanophotonic resonator to excite atoms... -273°C up to 8° more... financial institutions, medical facilities government agencies... perfect data protection"