Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik

Q 15.86: Poster

Montag, 14. März 2011, 16:30–19:30, P1

Entanglement Control via Magnetic Fields in Solid Systems — •Vivian França and Andreas Buchleitner — Physikalisches Institut, Albert-Ludwigs-Universität, Hermann-Herder-Str. 3, Freiburg, Germany

Entanglement, one of the most intriguing characteristics of Quantum Mechanics, is considered an important key in Quantum Information Theory. Among several possible systems, solids are good candidates for the development of devices for quantum information processes. While in condensed matter physics the Hubbard model has been largely used for describing properties of many-body systems, only recently entanglement studies have been performed in the one-dimensional Hubbard model. In homogeneous systems many interesting properties were analised, however previous investigations showed that the inhomogeneities present in real-life systems in general destroy the degree of entanglement in the system [1]. Here we use Density Functional Theory techniques for investigating the impact of spin imbalanced population and external magnetic fields onto the entanglement of inhomogeneous systems. In particular two inhomogeneous systems are investigated: chains with disordered impurities and harmonically confined chains, which can simulate for example cold atoms in optical lattices. Our preliminary results for the confined chains show that, although the degree of entanglement for the homogeneous case can not be recovered, it is possible to increase the entanglement degree by a factor of as much as 5 via the application of magnetic fields.

[1] V. V. França and K. Capelle, Phys. Rev. Lett. 100, 070403 (2008).