News Finding: The entanglement is a peculiar correlation that exists only in quantum mechanics and is at the very foundation of the possible functioning of quantum computers.
Paper Finding: First, in the stationary state the density of thermodynamic entropy coincides with that of the entanglement entropy in (2), as it has been shown analytically for free models .
News Context: In particular, the authors have shown that if in an extended quantum system far from equilibrium we look at just one part thereof, this has an entropy that increases in time, exactly like in thermodynamics. The origin of this entropy is in the entanglement between the part we are looking at and the rest of the system. The entanglement is a peculiar correlation that exists only in quantum mechanics and is at the very foundation of the possible functioning of quantum computers.
Paper Context: Physically, this reflects a generalized microcanonical ensemble for quenches, in which all the microstates corresponding to the macrostate have the same probability. First, in the stationary state the density of thermodynamic entropy coincides with that of the entanglement entropy in (2), as it has been shown analytically for free models . This implies that