Quantum squeezing and entanglement in a two-mode Bose-Einstein condensate with time-dependent Josephson-like coupling

S. Choi and N. P. Bigelow
Phys. Rev. A 72, 033612 – Published 16 September 2005

Abstract

Dynamical evolution of quantum mechanical squeezing and entanglement in a two-mode Bose-Einstein condensate (TBEC) with an adiabatic, time-varying Raman coupling is studied by finding analytical expressions for these quantities. In particular, we study the entanglement between the atoms in the condensate as well as that between the two modes. The nature of the enhanced quantum correlations in TBEC is clarified by considering squeezing and entanglement both with and without the nonlinear interaction turned on; it is found that entanglement approaching maximal value can be achieved with the nonlinear interactions present. Somewhat counterintuitively, greater squeezing is found in the absence of nonlinear interactions. This is due to the collapses and revivals of the TBEC quantum state induced by the nonlinear interactions. In addition, results involving the self-trapping phase state of TBEC indicate potential for creating a dynamically stable, macroscopic entangled quantum state which is relatively robust with respect to atom number fluctuations.

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  • Received 2 June 2005

DOI:https://doi.org/10.1103/PhysRevA.72.033612

©2005 American Physical Society

Authors & Affiliations

S. Choi and N. P. Bigelow

  • Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA

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Issue

Vol. 72, Iss. 3 — September 2005

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