Coherent light produced by lasers is not microscopic, we see its traces in the air. And we see the consequences (old fashioned holography and the ability to cut things with focused light, even at large distances). Room temperature is fine for that.
Superconductors used in the industry are not microscopic (and the temperatures are high enough to enable industrial use of them in rather common devices such as MRI scanners).
No, not microscopic.
Coherent light produced by lasers is not microscopic, we see its traces in the air. And we see the consequences (old fashioned holography and the ability to cut things with focused light, even at large distances). Room temperature is fine for that.
Superconductors used in the industry are not microscopic (and the temperatures are high enough to enable industrial use of them in rather common devices such as MRI scanners).