# Which temperature has been the highest to achieve a quantum logic operation?

My question is somehow related with a previous one: What is the most optimistic perspective of room-temperature solid-state QC?.

Regarding solid-state qubits,

• What is the highest temperature at which the simplest quantum logic operation has been performed? Let's say: initialization, arbitrary rotation and measuring, repeated to have enough statistics in order to verify a good fidelity. In which solid-state system has this happened?

• Sorry, I meant to write diamond, not silicon. Yes, the principle of using defects in insulators/semiconductors is very general, silicon works as well. The $T_1$ for the systems is very long (minutes), but the phase coherence is not nearly as long. I'm sure someone has tried higher than room temp, but again I think the gate fidelity just gets very low. – user157879 Apr 30 '18 at 6:37