Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

A: Fachverband Atomphysik

A 51: Materiewellenoptik

A 51.5: Vortrag

Freitag, 16. März 2012, 15:00–15:15, V53.01

Twin Matter Waves for Interferometry Beyond the Classical Limit — •Bernd Lücke¹, Manuel Scherer¹, Jens Kruse¹, Luca Pezze², Frank Deuretzbacher³, Philipp Hyllus³, Oliver Topic¹, Jan Peise¹, Wolfgang Ertmer¹, Jan Arlt⁴, Luis Santos³, Augusto Smerzi², and Carsten Klempt¹ — ¹Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany — ²Istituto Nazionale di Ottica (INO), Consiglio Nazionale delle Ricerche (CNR), and European Laboratory for Non-Linear Spectroscopy (LENS), 50125 Firenze, Italy — ³Institut für Theoretische Physik, Leibniz Universität Hannover, 30167 Hannover, Germany — ⁴Center for Quantum Optics (QUANTOP), Institut for Fysik og Astronomi, Aarhus Universitet, 8000 Århus C, Denmark

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 employ spin dynamics in Bose-Einstein condensates to create large ensembles of up to 10000 pair-correlated atoms and thus achieve this goal. The fluctuation of the population difference in the two output states is -6.9 dB below shot noise and is mainly limited by the detection noise of 30 atoms. Moreover we show that this twin state has an interferometric sensitivity -1.61 dB beyond the shot noise limit. Our proof-of-principle results point the way toward a new generation of atom interferometers.