We discuss the use of atom interferometry as a tool to search for Dark Matter (DM) composed of ultra-light scalar fields. Previous work on ultra-light DM detection using accelerometers has considered the possibility of equivalence principle violating effects whereby gradients in the dark matter field can directly produce relative accelerations between media of differing composition. In atom interferometers, we find that time-varying phase signals from oscillatory, or dilaton-like, DM can also arise due to changes in the atom rest mass that can occur between light-pulses throughout the interferometer sequence as well as changes in the earth's gravitational field. We estimate that several orders of magnitude of unexplored phase space for light DM fields can be probed with our proposed method.
Probing Ultralight Dark Matter at the Mega-Planck Scale with the Thorium Nuclear Clock
University of Delaware（特拉华大学）；High Energy Accelerator Research Organization (KEK)（高能加速器研究机构）；JILA, NIST and University of Colorado（JILA、美国国家标准与技术研究院和科罗拉多大学）；University of Colorado（科罗拉多大学）；Deutsches Elektronen-Synchrotron DESY（德国电子同步辐射研究所）；Leibniz Universität Hannover（汉诺威莱布尼茨大学）；Weizmann Institute of Science（魏茨曼科学研究所）；Physikalisch-Technische Bundesanstalt（德国物理技术联邦研究院）
SpaceQ -- Direct Detection of Ultralight Dark Matter with Space Quantum Sensors
University of California, Irvine（加州大学尔湾分校）；Fermi National Accelerator Laboratory（费米国家加速器实验室）；University of Chicago（芝加哥大学）；The University of Tokyo（东京大学）；University of Delaware（特拉华大学）；National Institute of Standards and Technology（美国国家标准与技术研究院）；University of Maryland（马里兰大学）
Oscillating nuclear charge radii as sensors for ultralight dark matter
Weizmann Institute of Science（魏茨曼科学研究所）；University of California, Berkeley（加州大学伯克利分校）；Physikalisch-Technische Bundesanstalt（德国联邦物理技术研究院）；Wayne State University（韦恩州立大学）；University of Delaware（特拉华大学）；Joint Quantum Institute, National Institute of Standards and Technology and the University of Maryland（国家计量院与马里兰大学联合量子研究所）
Sr atom interferometry with the optical clock transition as a gravimeter and a gravity gradiometer
我们利用锶原子的$^{1}$ S $_{0}$- $^3$ P $_0$时钟跃迁来表征重力仪和重力梯度仪的性能。我们使用这种新的量子传感器来测量重力加速度的相对灵敏度为$1.7\times10^{-5}$，代表了第一个实现的原子干涉重力仪的基础上的单光子跃迁。各种噪声的重力仪的贡献进行测量和表征，与目前的主要限制灵敏度被视为是固有的噪声的干涉激光本身。在重力梯度仪配置中，在人为引入的$π/2$ ~rad的微分相位下，获得了1.53~rad/ $\sqrt{Hz}$的微分相位灵敏度。我们实验研究的对比度和能见度的影响，基于各种参数，并实现了总的干涉时间为30毫秒，这是比以前报道的这种干涉仪。采用$^{88}$ Sr原子的本装置的表征和确定的限制为未来开发具有碱土和类碱土原子（例如，$^{87}$ Sr、Ca、Yb）。
Exponential enhancement of sensitivity in Ramsey interferometry with optically thick ensemble of atoms
Kazan Quantum Center, Kazan National Research Technical University n.a. A.N. Tupolev-KAI（喀山量子中心，喀山国立研究技术大学（A.N. 图波列夫-CAI））；Department of Physics, McGill University（麦吉尔大学物理系）
