Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 54: Poster 3
Q 54.78: Poster
Donnerstag, 15. März 2012, 16:30–19:00, Poster.I+II
Enhancement of block-block entanglement due to localized impurities in the 1D Fermi-Hubbard model — Tobias Brünner1,2, Erich Runge2, •Vivian França1, and Andreas Buchleitner1 — 1Physikalisches Institut, Albert-Ludwigs Universität, Freiburg, Germany — 2Technische Universität Ilmenau, Fachgebiet Theoretische Physik I, Ilmenau, Germany
While the study of entanglement in many-body interacting systems is important for a deeper understanding of the fundamental properties of entanglement in solids, the impact of naturally occurring impurities on the entanglement is an essential issue for the development of quantum information processors. We investigate the block-block entanglement of the 1D Fermi-Hubbard model in the presence of localized impurities. The block-block entanglement is defined as the entanglement between two specific blocks of sites in the chain. We find that, despite the presence of inhomogeneities, on average the block-block entanglement still obeys the area law with a logarithmic correction predicted by Calabrese-Cardy for homogeneous systems. In addition, for specific block positions, we find that entanglement is considerably enhanced by the impurities. This is in strong contrast to what has been observed for single-site entanglement, where inhomogeneities always destroy entanglement, and, therefore, suggests that the block-block entanglement is more robust against inhomogeneities.