Volume 83, Number 6, September 2008
Article Number 60004
Number of page(s) 5
Section General
Published online 08 September 2008
EPL, 83 (2008) 60004
DOI: 10.1209/0295-5075/83/60004

Creation of macroscopic quantum superposition states by a measurement

I. E. Mazets1, 2, G. Kurizki3, M. K. Oberthaler4 and J. Schmiedmayer2

1   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

received 8 June 2008; accepted in final form 31 July 2008; published September 2008
published online 8 September 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.

03.75.Mn - Multicomponent condensates; spinor condensates.
03.65.Ta - Foundations of quantum mechanics; measurement theory.

© EPLA 2008