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Condensed Matter Seminar: Probing strongly correlated quantum systems with single-atom resolution

Event Type
190 Engineering Sciences Bldg - corner Goodwin & Springfield 
Apr 19, 2013   1:00 pm  
Prof Stefan Kuhr - Dept of Physics - University of Strathclyde - Glasgow UK
Peggy Pennell
Originating Calendar
Physics - Condensed Matter Seminar

Ultracold atoms in optical lattices are a versatile tool to investigate fundamental properties of quantum many body systems. In a series of experiments performed at the Max-Planck Institute for Quantum Optics in Garching, we demonstrated how the control of such systems can be extended down to the most fundamental level of single atomic spins at specific lattice sites. Using a high-resolution optical imaging system, we were able to obtain fluorescence images of strongly interacting bosonic Mott insulators with single-atom and single-site resolution [1] and addressed the atomic spins with sub-diffraction-limited resolution [2]. In addition, we directly monitored the tunneling quantum dynamics of single atoms in the lattice, and observed quantum-correlated particle-hole pairs [3] spreading of correlations after a parameter quench [4], and the quantum dynamics of spin-impurities [5]. Our results open the path to a wide range of novel experiments from observation of strongly correlated fermionic systems, implementation of novel cooling schemes, and engineering of quantum many-body phases to quantum information processing.

[1] J. F. Sherson, C. Weitenberg, M. Endres, M. Cheneau, I. Bloch, S. Kuhr, Single-atom-resolved fluorescence imaging of an atomic Mott insulator, Nature 467, 68 (2010).
[2] C. Weitenberg, M. Endres, J. F. Sherson, M. Cheneau, P. Schau', T. Fukuhara, I.Bloch, S. Kuhr, Single-spin addressing in an atomic Mott insulator, Nature 471, 319 (2011).
[3] M. Endres, M. Cheneau, T. Fukuhara, C. Weitenberg, P. Schau', C. Gross, L. Mazza, M.C. Banuls, L. Pollet, I. Bloch, S. Kuhr, Observation of Correlated Particle-Hole Pairs and String Order in Low-Dimensional Mott Insulators, Science 334, 200 (2011).
[4]  M. Cheneau, P. Barmettler, D. Poletti, M. Endres, P. Schau', T. Fukuhara, C. Gross, I. Bloch, C. Kollath, S. Kuhr, Light-cone-like spreading of correlations in a quantum many-body system, Nature 481, 484 (2012).
[5] T. Fukuhara, A. Kantian, M. Endres, M. Cheneau, P. Schau', S. Hild, D. Bellem, U. Schollw'ck, T. Giamarchi, C. Gross, I. Bloch, S. Kuhr, Quantum dynamics of a single, mobile spin impurity, Nature Physics (2013), advance online publication, doi:10.1038/nphys2561

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