Title：Probing quantum many-body systems at the single-particle level
Speaker： Manuel Endres Max-Planck-Institut für Quantenoptik
Time： 2013-08-26 16:00-2013-08-26 17:00
Venue：FIT-1-222
Abstract:
The manipulation and detection of individual quantum excitations forms the basis of modern quantum optics experiments. However, most of these experiments have been restricted to systems composed of only a few particles.
In recent years, tremendous experimental progress has been made in probing strongly interacting many-body systems at the single-particle level. This was achieved by the single-site- and single-atom-resolved imaging and manipulation of quantum gases in optical lattices.
I will review these developments and present, in more detail, a few chosen experiments: The single-site-resolved detection of correlation functions [1] and the quantum dynamics of a mobile spin impurity [2]. These experiments show that quantum fluctuations of the many-body system become directly visible and that impurities can be implanted and studied with unprecedented control. However, the method has its limits [3], which I will analyze in the last part of talk. I will also outline future experiments that could overcome some of the restrictions.
[1] M. Endres, M. Cheneau, T. Fukuhara, C. Weitenberg, P. Schauss, C. Gross, L. Mazza, M. C. Banuls, L. Pollet, I. Bloch and S. Kuhr, Observation of Correlated Particle-Hole Pairs and String Order in Low-Dimensional Mott Insulators, Science 334, 200 (2011)
[2] T. Fukuhara, A. Kantian, M. Endres, M. Cheneau, P. Schauss, S. Hild, D. Bellem, U. Schollwock, T. Giamarchi, C. Gross, I. Bloch and S. Kuhr, Quantum dynamics of a mobile spin impurity, Nature Phys. 9, 235 (2013)
[3] M. Endres, M. Cheneau, T. Fukuhara, C. Weitenberg, P. Schauss, C. Gross, L. Mazza, M. C. Banuls, L. Pollet, I. Bloch and S. Kuhr, Single-site- and single-atom-resolved measurement of correlation functions, arXiv:1303.5652 (2013), to appear in Applied Physics B
Short Bio: