Let's get serious : Quantum Fluctuations and Vacuum Energy.

Where is the most likely place to measure quantum fluctuations acting on matter (or matter itself fluctuating) in an empirical/laboratory setting?

Related question : In which substrate does theory suggest the 'strongest' fluctuations should manifest, even if our technology is out of the grasp of such experiments?

I might claim that the fluid phase of electrons in cryogenic superconductors is the best experimental setting for measuring quantum fluctuations. I might be wrong in that claim , and please correct me as you see fit. I'm here to learn.

The standard model produces theoretical predictions of the strength (or "loudness") of the noise to be found in the background of the vacuum. That chalkboard calculation predicts that quantum fluctuations should contain more energy than a solid brick wall, by a factor of a thousand million million. That's fine, and I don't really want to expand on that topic. Rather, I am interested in literature which describes experimental measurements of random quantum fluctuations, and what value (heat/field strength/entropy/etc) is measured in those settings. I understand that it's going to be very very weak relative to work-a-day energies of room-temperature regimes, and likely small enough that it may only become physically measurable against background thermal noise in Bose-Einstein condensates. But I could be wrong-- you tell me.

TLDR; I'm up-to-speed on the concepts surrounding quantum fluctuations a la Heisenberg. I'm ready to start talking raw empirical numbers now. Looking for the best literature on the serious lab work. Thanks.