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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?
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I think your reference has the answer: nitrogen vacancy centers in diamond, where you can do one qubit gates at room temperature. In fact, even higher temperatures are possible, but you will have to play a tradeoff between fidelity and temperature at some point.

That said, NV centers are not scalable, and I don't think more than 2 qubits will ever be really possible due to the physical problems with interacting immobile NV centers which are randomly distributed.

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  • $\begingroup$ You are probably right, but phosphorus in silicon has also been shown to operate at room temperature, right? science.sciencemag.org/content/342/6160/830.full So the question would be: how high have people gone? (Or has no one ventured beyond RT?) $\endgroup$
    – agaitaarino
    Apr 30, 2018 at 6:26
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    $\begingroup$ 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. $\endgroup$
    – Dr. T. Q. Bit
    Apr 30, 2018 at 6:37
  • $\begingroup$ Let me see do some research on higher than room temp systems and get back to you. $\endgroup$
    – Dr. T. Q. Bit
    Apr 30, 2018 at 6:37

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