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Twin matter waves for interferometry beyond the classical limit. 2011
B Lücke, and
M Scherer, and
J Kruse, and
L Pezzé, and
F Deuretzbacher, and
P Hyllus, and
O Topic, and
J Peise, and
W Ertmer, and
J Arlt, and
L Santos, and
A Smerzi, and
C Klempt
Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany.
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.
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