By Masahito Ueda, The University of Tokyo
Entanglement is usually fragile and susceptible to perturbations. One may well wonder if entanglement plays a role in thermodynamic environments. We investigate this problem by solving an exact time evolution of a one-dimentional Bose gas based on the Lieb-Liniger model and show that entanglement plays crucial role in prethermalization in a Bose gas. This may be regarded as an example of decoherence-free subspace in the context of thermalization.