Generation of macroscopic superposition states in ring superlattices

Details Generation of macroscopic superposition states in ring superlattices Generation of macroscopic superposition states in ring superlattices

2007-11-24

arxiv.org/abs/0711.3831v2

Phys. Rev. A 77, 023622 (2008)

Physics

Condensed Matter

Other Condensed Matter

9 pages, 10 figures; minor corrections

Scientific paper

10.1103/PhysRevA.77.023622

Ultracold bosons in rotating ring lattices have previously been shown to form macroscopic superpositions of different quasi-momentum states. We demonstrate that the generation of such kind of states using slightly non-uniform ring lattices has several advantages: the energy gap decreases less severely with the 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 quasi-momentum 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.

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