Controlling and Detecting Spin Correlations of Ultracold Atoms in Optical Lattices

Stefan Trotzky, Yu-Ao Chen, Ute Schnorrberger, Patrick Cheinet, and Immanuel Bloch
Phys. Rev. Lett. 105, 265303 – Published 29 December 2010
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We report on the controlled creation of a valence bond state of delocalized effective-spin singlet and triplet dimers by means of a bichromatic optical superlattice. We demonstrate a coherent coupling between the singlet and triplet states and show how the superlattice can be employed to measure the singlet-fraction employing a spin-blockade effect. Our method provides a reliable way to detect and control nearest-neighbor spin correlations in many-body systems of ultracold atoms. Being able to measure these correlations is an important ingredient in studying quantum magnetism in optical lattices. We furthermore employ a SWAP operation between atoms which are part of different triplets, thus effectively increasing their bond-length. Such a SWAP operation provides an important step towards the massively parallel creation of a multiparticle entangled state in the lattice.

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  • Received 13 September 2010


© 2010 The American Physical Society

Authors & Affiliations

Stefan Trotzky1,2,3, Yu-Ao Chen1,2,3, Ute Schnorrberger1,2,3, Patrick Cheinet4, and Immanuel Bloch1,2,3

  • 1Fakultät für Physik, Ludwig-Maximilians-Universität, Schellingstrasse 4, 80798 München, Germany
  • 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany
  • 3Institut für Physik, Johannes Gutenberg-Universität, Staudingerweg 7, 54099 Mainz, Germany
  • 4Laboratoire Charles Fabry, Institut d’Optique, Campus Polytechnique, RD 128, 91127 Palaiseau Cedex, France

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Vol. 105, Iss. 26 — 31 December 2010

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