Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 50: Quantum information: Concepts and methods III

Q 50.7: Vortrag

Donnerstag, 20. März 2014, 18:00–18:15, Kinosaal

Area law violation for the mutual information in a nonequilibrium steady stateViktor Eisler1 and •Zoltán Zimborás21Eötvös University, Budapest, Hungary — 2University of the Basque Country UPV/EHU, Bilbao, Spain

We study the nonequilibrium steady state of an infinite chain of free fermions, resulting from an initial state where the two sides of the system are prepared at different temperatures. The mutual information is calculated between two adjacent segments of the chain and is found to scale logarithmically in the subsystem size. This provides the first example of the violation of the area law in a quantum many-body system outside a zero temperature regime. The prefactor of the logarithm is obtained analytically and, furthermore, the same prefactor is shown to govern the logarithmic increase of mutual information in time, before the system relaxes locally to the steady state.

V. Eisler and Z. Zimborás, arXiv:1311.3327

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