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Time-resolved observation of coherent multi-body interactions in quantum phase revivals

xbinbzy 添加于 2010-5-26 22:51 | 1858 次阅读 | 0 个评论

作者
Will S, Best T, Schneider U, Hackermüller L, Lühmann D-S, Bloch I
摘要
Interactions lie at the heart of correlated many-body quantum phases1, 2, 3. Typically, the interactions between microscopic particles are described as two-body interactions. However, it has been shown that higher-order multi-body interactions could give rise to novel quantum phases with intriguing properties. So far, multi-body interactions have been observed as inelastic loss resonances in three- and four-body recombinations of atom–atom and atom–molecule collisions4, 5, 6. Here we demonstrate the presence of effective multi-body interactions7 in a system of ultracold bosonic atoms in a three-dimensional optical lattice, emerging through virtual transitions of particles from the lowest energy band to higher energy bands. We observe such interactions up to the six-body case in time-resolved traces of quantum phase revivals8, 9, 10, 11, using an atom interferometric technique that allows us to precisely measure the absolute energies of atom number states at a lattice site. In addition, we show that the spectral content of these time traces can reveal the atom number statistics at a lattice site, similar to foundational experiments in cavity quantum electrodynamics that yield the statistics of a cavity photon field12. Our precision measurement of multi-body interaction energies provides crucial input for the comparison of optical-lattice quantum simulators with many-body quantum theory.
详细资料
- 文献种类: Journal Article
- 期刊名称: Nature
- 期刊缩写: Nature
- 期卷页: 2010年第465卷第7295期 197-201页
- ISBN: 0028-0836
学科领域生物医药 » 中医中药学
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