Europhys. Lett.
Volume 73, Number 4, February 2006
Page(s) 499 - 505
Section General
Published online 11 January 2006
Europhys. Lett., 73 (4), pp. 499-505 (2006)
DOI: 10.1209/epl/i2005-10435-1

Test of the quantumness of atom-atom correlations in a bosonic gas

D. Ivanov1 and S. Wallentowitz2

1  Laser Research Institute, St. Petersburg State University 5 Uliyanovskaya, Petrodvoretz, St. Petersburg, Russia
2  Facultad de Física, Pontificia Universidad Católica de Chile Casilla 306, Santiago 22, Chile

received 30 September 2005; accepted in final form 21 December 2005
published online 11 January 2006

It is shown how the quantumness of atom-atom correlations in a trapped bosonic gas can be made observable. Application of continuous feedback control of the center of mass of the atomic cloud is shown to generate oscillations of the spatial extension of the cloud, whose amplitude can be directly used as a characterization of atom-atom correlations. Feedback parameters can be chosen such that the violation of a Schwarz inequality for atom-atom correlations can be tested at noise levels much higher than the standard quantum limit.

05.40.-a - Fluctuation phenomena, random processes, noise, and Brownian motion.
05.30.-d - Quantum statistical mechanics.
05.30.Jp - Boson systems.

© EDP Sciences 2006