title: Entanglement entropy of one-dimensional gases.
abstract: We introduce a systematic framework to calculate the bipartite entanglement entropy of a spatial subsystem in a one-dimensional quantum gas which can be mapped into a noninteracting fermion system. To show the wide range of applicability of the proposed formalism, we use it for the calculation of the entanglement in the eigenstates of periodic systems, in a gas confined by boundaries or external potentials, in junctions of quantum wires, and in a time-dependent parabolic potential.
authors.affiliation: Dipartimento di Fisica dell'Università di Pisa and INFN, Pisa, Italy.
authors.forename: Pasquale
authors.initials: P
authors.lastname: Calabrese
authors.forename: Mihail
authors.initials: M
authors.lastname: Mintchev
authors.forename: Ettore
authors.initials: E
authors.lastname: Vicari