Science Daily 6, 2022
Researchers in Japan provide simple theorems that show what kinds of long-range entanglement can survive at nonzero temperatures. At temperatures above absolute zero, quantum entanglement must contend with thermal jostling of particles, which is detrimental to long-range entanglement persisting at sufficiently high temperatures. Unlike high-temperature phases, however, there are relatively low temperatures in which not all long-range quantum effects are strictly prohibited, and long-range entanglement can survive even at room temperatures. They proved that entanglement between two subsystems has a finite characteristic length scale at arbitrary temperatures regardless of the system details and the spatial dimension. This result is consistent with observations that long-range entanglement survives at nonzero temperatures only in the form of multipartite entanglement among more than three subsystems… read more. Open Access TECHNICAL ARTICLEÂ
Infographic explaining the experiment. Credit: RIKEN