Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany.
Science. 2011 Nov 11;334(6057):773-6. doi: 10.1126/science.1208798. Epub 2011 Oct 13.
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.
原子系综干涉仪是现代精密测量的一个组成部分。然而，这些干涉仪受到基本的散粒噪声限制，只有通过在原子之间产生量子纠缠才能克服这种限制。我们利用玻色-爱因斯坦凝聚体中的自旋动力学，在干涉灵敏度上创造了多达 10(4)个对关联原子的大型系综，超出散粒噪声限制-1.61(-1.1)(+0.98)分贝。我们的原理验证结果为新一代原子干涉仪指明了方向。
