In the 1950s, physicist Léon Brillouin published a landmark paper refuting the idea that adding a single diode, a one-way electrical gate ... circuit are at the same temperature and heat does not ...

This is coupled to a photon racetrack carved out of silicon. A C-NOT logic gate requires two input photons. So the circuit works by zapping the quantum dot twice, generating two photons.

A diode allows current to flow one way but not the other in an electrical circuit. It's essentially ... we've shown that you can add gates and apply electric fields to tune this effect," explained ...