RT Journal Article
SR Electronic
T1 A Quantum Many-Body Spin System in an Optical Lattice Clock
JF Science
JO Science
FD American Association for the Advancement of Science
SP 632
OP 636
DO 10.1126/science.1236929
VO 341
IS 6146
A1 Martin, M. J.
A1 Bishof, M.
A1 Swallows, M. D.
A1 Zhang, X.
A1 Benko, C.
A1 von-Stecher, J.
A1 Gorshkov, A. V.
A1 Rey, A. M.
A1 Ye, Jun
YR 2013
UL http://science.sciencemag.org/content/341/6146/632.abstract
AB Optical lattice clocks with alkaline earth atoms provide one of the most stable time-keeping systems. Such clocks, in general, exhibit shifts in their transition frequencies as a consequence of interactions between atoms. Can this sensitivity be used to explore the dynamics of strongly correlated quantum systems? Martin et al. (p. 632) used a 1-dimensional optical lattice clock to study quantum many-body effects. Whereas the clock shift itself could be modeled within the mean field approximation, quantities such as spin noise required a full many-body treatment. This system may be useful for the quantum simulation of exotic magnetism. Strongly interacting quantum many-body systems arise in many areas of physics, but their complexity generally precludes exact solutions to their dynamics. We explored a strongly interacting two-level system formed by the clock states in 87Sr as a laboratory for the study of quantum many-body effects. Our collective spin measurements reveal signatures of the development of many-body correlations during the dynamical evolution. We derived a many-body Hamiltonian that describes the experimental observation of atomic spin coherence decay, density-dependent frequency shifts, severely distorted lineshapes, and correlated spin noise. These investigations open the door to further explorations of quantum many-body effects and entanglement through use of highly coherent and precisely controlled optical lattice clocks.