@article {Martin632,
author = {Martin, M. J. and Bishof, M. and Swallows, M. D. and Zhang, X. and Benko, C. and von-Stecher, J. and Gorshkov, A. V. and Rey, A. M. and Ye, Jun},
title = {A Quantum Many-Body Spin System in an Optical Lattice Clock},
volume = {341},
number = {6146},
pages = {632--636},
year = {2013},
doi = {10.1126/science.1236929},
publisher = {American Association for the Advancement of Science},
abstract = {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.},
issn = {0036-8075},
URL = {https://science.sciencemag.org/content/341/6146/632},
eprint = {https://science.sciencemag.org/content/341/6146/632.full.pdf},
journal = {Science}
}