A step closer to optical computers: Researchers develop an all-optical universal gate

https://phys.org/news/2024-07-closer-optical-universal-gate.html

"room temperature polariton condensate universal NOR gate with multiple inputs...  completely optical, up to 1 THz, 100X faster than electric, reproduced/ connected/ cascaded on circuit...  successfully coped with 12 inputs... amplifies weak optical signals tens of thousands of times, by.condensing polaritons into ground state, then into non-ground state at higher energy... disabling the optical signal with the help of light, switching a logical unit to zero"