MIT researchers using superconducting quantum bits connected to a microwave transmission line have shown how the qubits can generate on demand the photons, or particles of light, necessary for communication between quantum processors.
![](https://scx1.b-cdn.net/csz/news/tmb/2020/generatingph.jpg)
Source:
https://phys.org/news/2020-10-photons-quantum.html