Entanglement entropy of one-dimensional gases |
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Authors: | Calabrese Pasquale Mintchev Mihail Vicari Ettore |
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Affiliation: | Dipartimento di Fisica dell'Università di Pisa and INFN, Pisa, Italy. |
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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. |
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