Twin Matter Waves for Interferometry Beyond the Classical Limit

Year: 2011

Authors: Luecke B., Scherer M., Kruse J., Pezze L., Deuretzbacher F., Hyllus P., Topic O., Peise J., Ertmer W., Arlt J., Santos L., Smerzi A., Klempt C.

Autors Affiliation: Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany;
Istituto Nazionale di Ottica (INO), Consiglio Nazionale delle Ricerche (CNR), and European Laboratory for Non-Linear Spectroscopy (LENS), 50125 Firenze, Italy;
Institut für Theoretische Physik, Leibniz Universität Hannover, 30167 Hannover, Germany;
Department of Theoretical Physics, The University of the Basque Country, 48080 Bilbao, Spain;
Center for Quantum Optics (QUANTOP), Institut for Fysik og Astronomi, Aarhus Universitet, 8000A°rhus C, Denmark

Abstract: Interferometers with atomic ensembles are an integral part of modern precision metrology. However, these interferometers are fundamentally restricted by the shot noise limit, which can only be overcome by creating quantum entanglement among the atoms. We used spin dynamics in Bose-Einstein condensates to create large ensembles of up to 10(4) pair-correlated atoms with an interferometric sensitivity -1.61(-1.1)(+0.98) decibels beyond the shot noise limit. Our proof-of-principle results point the way toward a new generation of atom interferometers.

Journal/Review: SCIENCE

Volume: 334 (6057)      Pages from: 773  to: 776

More Information: We thank E. Rasel for stimulating discussions and P. Zoller for helpful comments. We acknowledge support from the Centre for Quantum Engineering and Space-Time Research (QUEST), the European Science Foundation (EuroQUASAR), and the Danish National Research Foundation Center for Quantum Optics. P.H. acknowledges financial support of the European Research Council Starting Grant GEDENTQOPT. This work was supported in part by Provincia Autonoma di Trento within the activities of the BEC center. L.P. acknowledges support by the Laboratoire Charles Fabry de L\’Institut d\’Optique where part of this work was completed.
KeyWords: standard quantum limit; beam splitter; entanglement; states; photons
DOI: 10.1126/science.1208798

Citations: 296
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