Testing broken U(1) symmetry in a two-component atomic Bose-Einstein condensate

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Abstract

We present a scheme for determining if the quantum state of a small trapped atomic Bose-Einstein condensate is a state with a well-defined number of atoms, a Fock state, or a state with a broken U(1) gauge symmetry, a coherent state. The proposal is based on the observation of Ramsey fringes. The population difference measured by a Ramsey fringe experiment will exhibit collapse and revivals due to the mean-field interactions. The collapse and revival times depend on the relative strengths of the mean-field interactions for the two components and the initial quantum state of the condensate.

Original languageEnglish
Pages (from-to)8
Number of pages1
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume64
Issue number1
DOIs
StatePublished - 2001

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