Generation of macroscopic superposition states in ring superlattices
Generation of macroscopic superposition states in ring superlattices
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DOI：
10.1103/physreva.77.023622
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发表时间：
2007-11
影响因子：
2.9
通讯作者：
A. Nunnenkamp;A. Rey;K. Burnett
中科院分区：
文献类型：
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作者：
A. Nunnenkamp;A. Rey;K. Burnett
旋转环晶格中的超冷玻色子以前已经被证明形成不同准质子态的宏观叠加。我们证明了使用略微不均匀的环形晶格产生这种态有几个优点：能隙随粒子数的增加而减少得不那么严重，对偏离临界旋转频率的失谐的敏感性降低，并且该方案不限于公度填充。我们证明了在飞行时间吸收成像中可以区分不同的准质子态，并建议通过旋转频率的突然变化引起的多体振荡来探测关联。
Ultracold bosons in rotating ring lattices have previously been shown to form macroscopic superpositions of different quasimomentum states. We demonstrate that the generation of this kind of state using slightly nonuniform ring lattices has several advantages: the energy gap decreases less severely with increasing number of particles, the sensitivity to detunings from the critical rotation frequency is reduced, and the scheme is not limited to commensurate filling. We show that different quasimomentum states can be distinguished in time-of-flight absorption imaging and propose to probe correlations via the many-body oscillations induced by a sudden change in the rotation frequency.