Scientists reconstruct full state of a quantum liquid

https://phys.org/news/2023-04-scientists-reconstruct-full-state-quantum.html

"reconstructs full stat quantum liquid, consistent with quantum field theory similar to those that describe fundamental particles in universe... tomography quantum system...  ultracold atoms trapped on chip... created 2 copies quantum system—cigar-shaped atom clouds... Initially strongly coupled quantum liquid split in 2 evolving independent liquids recombine it to reveal ripples in liquid... ripples in a pond after throwing a rock in it and inferring the properties of the rock, such as its size, shape, and weight"