Quantum many-body dynamics of coupled double-well superlattices

Peter Barmettler, Ana Maria Rey, Eugene Demler, Mikhail D. Lukin, Immanuel Bloch, and Vladimir Gritsev
Phys. Rev. A 78, 012330 – Published 17 July 2008

Abstract

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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  • Received 11 March 2008

DOI:https://doi.org/10.1103/PhysRevA.78.012330

©2008 American Physical Society

Authors & Affiliations

Peter Barmettler1, Ana Maria Rey2, Eugene Demler3, Mikhail D. Lukin3, Immanuel Bloch4, and Vladimir Gritsev3

  • 1Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
  • 2Institute of Theoretical Atomic, Molecular and Optical Physics, Harvard University, Cambridge, Massachusetts 02138, USA
  • 3Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
  • 4Institut für Physik, Johannes Gutenberg-Universität, Staudingerweg 7, 55099 Mainz, Germany

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Issue

Vol. 78, Iss. 1 — July 2008

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