4 ms·
> Superconductivity implies no interaction with the environment, which is necessary and sufficient to maintain superpositions. I am not sure what you mean here
by thethirdone 9y ago
> Superconductivity implies no interaction with the environment, which is necessary and sufficient to maintain superpositions.
I am not sure what you mean here. Superconducting magnets are often used to control plasma (part of the environment) so it doesn't imply isolation from the environment.
Superconducting qubits are only superconducting because josephson junctions happen to be good candidates to make qubits out of. Ion traps (which generally have much better coherence times than superconducting qubits) and photon based systems don't need superconductivity.
- akvadrako 9y agoWhat I mean is that waste heat is equivalent to decoherence. If you use superconductors to do work, then they are no longer superconducting - that work introduces resistance. To do otherwise would violate conservation of energy. I'm not sure how to make it more clear, but decoherence happens because some energy / information is transmitted into the environment. That loss of information is why superpositions collapse. Maybe the confusion is what I mean by superconducting - I mean zero resistance circuits. It's not about what it's made of.