Physicists find signatures of highly entangled quantum matter

https://phys.org/news/2022-07-physicists-signatures-highly-entangled-quantum

"Kagome spin model... QSL phase, and schematic plot... entanglement entropy... measuring change of free energy... nonequilibrium process. The topological entropy (γ), which characterizes long-range topological order, can be extracted by subtracting the short-range contribution, which is proportional to the length of the entanglement boundary (l) from the total entanglement entropy(S), by fitting the data of entanglement entropy of different entanglement boundary length to a straight line (S=al-γ)"