Controlling and Detecting Spin Correlations of Ultracold Atoms in Optical lattices

Details Controlling and Detecting Spin Correlations of Ultracold Atoms in Optical lattices Controlling and Detecting Spin Correlations of Ultracold Atoms in Optical lattices

2010-09-13

arxiv.org/abs/1009.2415v2

Phys. Rev. Lett. 105, 265303 (2010)

Physics

Condensed Matter

Quantum Gases

6 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.105.265303

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 to study quantum magnetism in optical lattices. We furthermore employ a SWAP operation between atoms being part of different triplets, thus effectively increasing their bond-length. Such SWAP operation provides an important step towards the massively parallel creation of a multi-particle entangled state in the lattice.

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