Entangled matter waves for sub-shot-noise interferometry
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 
dB beyond the shot noise limit. Our proof-of-principle results point the way toward a new generation of atom interferometers.
B. Lücke et al., Science, 13 October 2011
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