Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 68: Materiewellenoptik

Q 68.5: 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 Klempt11Institut 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.

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