Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 28: Cold atoms V - optical lattices (joint session A/Q)
Q 28.1: Talk
Tuesday, March 6, 2018, 14:00–14:15, K 0.011
Two- and four-body spin-exchange interactions in optical lattices — •Bing Yang1,2, Han-ning Dai1,2, Andreas Reingruber1, Hui Sun1,2, Yu-ao Chen2, Zhen-Sheng Yuan2,1, and Jian-Wei Pan2,1 — 1Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany — 2Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
Ultracold atoms in optical lattices represent an ideal platform for modeling elementary spin interactions. Here we report on the observations of two- and four-body spin-exchange interactions in an optical superlattice. Using a spin-dependent superlattice, atomic spins can be coherently addressed and manipulated. Bell states are generated via spin superexchange process and their quantum correlations are detected. A minimum toric code Hamiltonian in which the four-body ring-exchange interaction is the dominant term, is implemented by engineering a Hubbard Hamiltonian in disconnected plaquette arrays. Our work represents an essential step towards studying topological matters with many-body systems and the applications in quantum computation and simulation.