Relationship between spin squeezing and single-particle coherence in two-component Bose-Einstein condensates with Josephson coupling

Details Relationship between spin squeezing and single-particle coherence in two-component Bose-Einstein condensates with Josephson coupling Relationship between spin squeezing and single-particle coherence in two-component Bose-Einstein condensates with Josephson coupling

2008-08-14

arxiv.org/abs/0808.1957v2

Phys. Rev. A 78, 063620 (2008)

Physics

Condensed Matter

Other Condensed Matter

4 figures, revtex4, new refs. are added

Scientific paper

10.1103/PhysRevA.78.063620

We investigate spin squeezing of a two-mode boson system with a Josephson coupling. An exact relation between the squeezing and the single-particle coherence at the maximal-squeezing time is discovered, which provides a more direct way to measure the squeezing by readout the coherence in atomic interference experiments. We prove explicitly that the strongest squeezing is along the $J_z$ axis, indicating the appearance of atom number-squeezed state. Power laws of the strongest squeezing and the optimal coupling with particle number $N$ are obtained based upon a wide range of numerical simulations.

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