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arXiv 1002.3624quant-phphysics.atom-ph
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Ramsey型相干原子的量子投影噪声限制干涉测量

Quantum projection noise limited interferometry with coherent atoms in a Ramsey type setup

D. Döring, G. McDonald, J. E. Debs, C. Figl, P. A. Altin, H. -A. Bachor, N. P. Robins, J. D. Close

摘要:

在两能级系统的非关联系综中,对粒子数的每一次测量都受到所谓的量子投影噪声极限的限制。在这里,我们提出了量子投影噪声限制性能的拉姆齐型干涉仪使用自由传播的相干原子。实验装置是基于一个电光调制器在一个固有的稳定Sagnac干涉仪,光学耦合的两个干涉原子状态通过双光子拉曼跃迁。超越量子投影噪声极限需要使用降低的量子不确定性(压缩)态。所描述的实验演示了原子干涉在基本的噪声水平,并允许原子激光器中可能的压缩效应的观察,可能导致原子干涉仪的灵敏度提高。

英文摘要:

Every measurement of the population in an uncorrelated ensemble of two-level systems is limited by what is known as the quantum projection noise limit. Here, we present quantum projection noise limited performance of a Ramsey type interferometer using freely propagating coherent atoms. The experimental setup is based on an electro-optic modulator in an inherently stable Sagnac interferometer, optically coupling the two interfering atomic states via a two-photon Raman transition. Going beyond the quantum projection noise limit requires the use of reduced quantum uncertainty (squeezed) states. The experiment described demonstrates atom interferometry at the fundamental noise level and allows the observation of possible squeezing effects in an atom laser, potentially leading to improved sensitivity in atom interferometers.

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