Journal article

Quantum many-body dynamics of coupled double-well superlattices

  • Barmettler, Peter Department of Physics, University of Fribourg, Switzerland
  • Rey, Ana Maria Institute of Theoretical Atomic, Molecular and Optical Physics, Harvard University, Cambridge, Ma, USA
  • Demler, Eugene Department of Physics, Harvard University, Cambridge, Ma, USA
  • Lukin, Mikhail D. Department of Physics, Harvard University, Cambridge, Ma, USA
  • Bloch, Immanuel Institut für Physik, Johannes Gutenberg-Universität, Mainz, Germany
  • Gritsev, Vladimir Department of Physics, Harvard University, Cambridge, Ma, USA
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  • Physical Review A. - 2008, vol. 78, p. 012330
English We propose a method for controllable generation of nonlocal entangled pairs using spinor atoms loaded in an optical superlattice. Our scheme iteratively increases the distance between entangled atoms by controlling the coupling between the double wells. When implemented in a finite linear chain of 2N atoms, it creates a triplet valence bond state with large persistency of entanglement (of the order of N). We also study the nonequilibrium dynamics of the one-dimensional ferromagnetic Heisenberg Hamiltonian and show that the time evolution of a state of decoupled triplets on each double well leads to the formation of a highly entangled state where short-distance antiferromagnetic correlations coexist with longer-distance ferromagnetic ones. We present methods for detection and characterization of the various dynamically generated states. These ideas are a step forward toward the use of atoms trapped by light as quantum-information processors and quantum simulators.
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