Coherence dynamics of two-mode condensates in asymmetric potentials

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M. Jääskeläinen and P. Meystre
Department of Physics and College of Optical Sciences, The University of Arizona, Tucson, Arizona 85721, USA

Received 26 August 2005; published 3 January 2006

Detectionof weak forces with an accuracy beyond the standard quantumlimit holds promise both for fundamental research and for technologicalapplications. Schemes involving ultracold atoms for such measurements are nowconsidered to be prime candidates for increased sensitivity. In thispaper we use a combination of analytical and numerical techniquesto investigate the possible subshot-noise estimation of applied force fieldsthrough detection of coherence dynamics of Bose-condensed atoms in asymmetricdouble-well traps. Following a semiclassical description of the system dynamicsand fringe visibility, we present numerical simulations of the fullquantum dynamics that demonstrate the dynamical production of phase squeezingbeyond the standard quantum limit. Nonlinear interactions are found tolimit the achievable amount to a finite value determined bythe external weak force.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.013602
DOI:	10.1103/PhysRevA.73.013602
PACS:	03.75.Be; 03.65.Ge; 05.60.Gg 03.75.Be Atom and neutron optics 03.65.Ge Solutions of wave equations: bound states in quantum mechanics 05.60.Gg Quantum transport YEAR: 2006
KEYWORDS:	atom optics, boson systems, shot noise

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