2012/04/18 by Bernd Lücke, Manuel Scherer, Jens Kruse +10 · 1 citation
Physics and Astronomy · #cond-mat.quant-gas #physics.atom-ph #quant-ph
paper · pdf · doi:10.1126/science.1208798
published as Science 334, 773-776 (2011) · main text plus supporting online material: 12 pages 9 figures
arxiv created 2012/04/18 · arxiv updated 2012/04/19
Interferometers with atomic ensembles constitute 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 104 pair-correlated atoms with an interferometric sensitivity -1.61+0.98-1.1 dB beyond the shot noise limit. Our proof-of-principle results point the way toward a new generation of atom interferometers.