Robust Mesoscopic Superposition of Strongly Correlated Ultracold Atoms

Details Robust Mesoscopic Superposition of Strongly Correlated Ultracold Atoms Robust Mesoscopic Superposition of Strongly Correlated Ultracold Atoms

2010-07-23

arxiv.org/abs/1007.4038v4

Phys. Rev. A 82, 063623 (2010)

Physics

Quantum Physics

8 pages, 4 figures, extended version includes computational details, to appear in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.82.063623

We propose a scheme to create coherent superpositions of annular flow of strongly-interacting bosonic atoms in a 1D ring trap. The non-rotating ground state is coupled to a vortex state with mesoscopic angular momentum by means of a narrow potential barrier and an applied phase that originates from either rotation or a synthetic magnetic field. We show that superposition states in the Tonks-Girardeau regime are robust against single-particle loss due to the effects of strong correlations. The coupling between the mesoscopically distinct states scales much more favorably with particle number than in schemes relying on weak interactions, thus making particle numbers of hundreds or thousands feasible. Coherent oscillations induced by time variation of parameters may serve as a 'smoking gun' signature for detecting superposition states.

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