Generation of macroscopic superposition states in ring superlattices

Andreas Nunnenkamp, Ana Maria Rey, and Keith Burnett
Phys. Rev. A 77, 023622 – Published 25 February 2008

Abstract

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.

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  • Received 26 November 2007

DOI:https://doi.org/10.1103/PhysRevA.77.023622

©2008 American Physical Society

Authors & Affiliations

Andreas Nunnenkamp1,*, Ana Maria Rey2, and Keith Burnett1,3

  • 1Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom
  • 2Institute for Theoretical Atomic, Molecular and Optical Physics, Cambridge, Massachusetts 02138, USA
  • 3University of Sheffield, Firth Court, Western Bank, Sheffield S10 2TN, United Kingdom

  • *a.nunnenkamp1@physics.ox.ac.uk

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Vol. 77, Iss. 2 — February 2008

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