Volume 83, Number 6, September 2008
|Number of page(s)||5|
|Published online||08 September 2008|
Creation of macroscopic quantum superposition states by a measurement
A.F. Ioffe Physico-Technical Institute - 194021 St. Petersburg, Russia
2 Atominstitut der Österreichischen Universitäten - 1020 Vienna, Austria, EU
3 Chemical Physics Department, Weizmann Institute of Science - 76100 Rehovot, Israel
4 Kirchhoff Institut für Physik, Universität Heidelberg - 69120 Heidelberg, Germany, EU
Accepted: 31 July 2008
We propose a novel protocol for the creation of macroscopic quantum superposition (MQS) states based on a measurement of a non-monotonous function of a quantum collective variable. The main advantage of this protocol is that it does not require switching on and off nonlinear interactions in the system. We predict this protocol to allow the creation of multiatom MQS by measuring the number of atoms coherently outcoupled from a two-component (spinor) Bose-Einstein condensate.
PACS: 03.75.Mn – Multicomponent condensates; spinor condensates / 03.65.Ta – Foundations of quantum mechanics; measurement theory
© EPLA, 2008
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