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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Probing BEC phase fluctuations with atomic quantum dots

M Bruderer1 and D Jaksch

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We consider the dephasing of two internal states |0rang and |1rang of a trapped impurity atom, a so-called atomic quantum dot (AQD), where only state |1rang couples to a Bose–Einstein condensate (BEC). A direct relation between the dephasing of the internal states of the AQD and the temporal phase fluctuations of the BEC is established. Based on this relation we suggest a scheme to probe BEC phase fluctuations non-destructively via dephasing measurements of the AQD. In particular, the scheme allows to trace the dependence of the phase fluctuations on the trapping geometry of the BEC.


PACS

03.75.Hh Static properties of condensates; thermodynamical, statistical and structural properties

03.65.Vf Phases: geometric; dynamic or topological

05.30.Jp Boson systems

03.65.Ta Foundations of quantum mechanics; measurement theory

Subjects

Quantum gases, liquids and solids

Statistical physics and nonlinear systems

Quantum information and quantum mechanics

Dates

Issue 6 (June 2006)

Received 30 January 2006

Published 5 June 2006



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