超越经典极限的双物质波
Twin matter waves for interferometry beyond the classical limit
摘要：
原子集成干涉仪是现代精密计量的重要组成部分。然而，这些干涉仪从根本上受到散粒噪声极限的限制，这只能通过在原子之间产生量子纠缠来克服。我们使用自旋动力学玻色-爱因斯坦凝聚体，以创建高达$10^4$对相关原子的干涉灵敏度超过散粒噪声限制$-1.61^{+0.98}_{-1.1}$ dB的大型合奏。我们的原理证明结果为新一代原子干涉仪指明了方向。
英文摘要：
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 $10^4$ 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.
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