Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 59: Quantum gases: Optical lattices III
Q 59.3: Vortrag
Freitag, 22. März 2013, 11:30–11:45, F 342
Creation and dynamics of remote spin-entangled pairs in the expansion of strongly correlated fermionic atoms — •Stefan Keßler1, Ian McCulloch2, and Florian Marquardt1,3 — 1Institute for Theoretical Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany — 2School of Physical Sciences, University of Queensland, Brisbane, Australia — 3Max Planck Institute for the Science of Light, Erlangen, Germany
We consider the nonequilibrium dynamics of an interacting spin-1/2 fermionic gas in a one-dimensional optical lattice after switching off the confining potential. In particular, we study the creation and the time evolution of spatially separated, spin-entangled fermionic pairs. This results in entanglement between pairs of singly occupied lattice sites across the cloud, which we quantify by the concurrence. The time-dependent density-matrix renormalization group is used to simulate the time evolution and evaluate the two-site correlation functions, from which the concurrence is calculated. We find that the entangled fermionic pairs are found at different locations, depending on the onsite interaction strength. Moreover, we briefly discuss the prospects of experimentally observing these phenomena by measuring the spin-entanglement using single-site and spin-dependent detection of the particle number.