High-accuracy inertial measurements with cold-atom sensors

Metrology with Atom Interferometry: Inertial Sensors from Laboratory to Field Applications

Developments in atom interferometry have led to atomic inertial sensors with extremely high sensitivity. Their performances are for the moment limited by the ground vibrations, the impact of which is exacerbated by the sequential operation, resulting in aliasing and dead time. We discuss several experiments performed at LNE-SYRTE in order to reduce these problems and achieve the intrinsic limit of atomic inertial sensors. These techniques have resulted in transportable and high-performance instruments that participate in gravity measurements, and pave the way to applications in inertial naviga…

采用连续冷原子束的闭环双原子干涉仪惯性传感器

Closed-Loop Dual-Atom-Interferometer Inertial Sensor with Continuous Cold Atomic Beams

本研究提出采用连续冷原子束的闭环双原子干涉仪惯性传感器，通过双路信号和差解耦加速度与转速，灵敏度较单干涉仪提升约1.86倍，实现了高稳定性的短 interrogation 时间惯性测量，为高数据率现场应用的原子惯性测量单元奠定基础。

A prototype industrial laser system for cold atom inertial sensing in space

We present the design, realization, characterization and testing of an industrial prototype of a laser system, which is based on frequency doubling of telecom lasers and features all key functionalities to drive a cold atom space gradiometer based on the architecture proposed in [Trimeche et al, 2019]. Testing was performed by implementing the laser system onto a ground based atomic sensor currently under development. The system reaches a Technology Readiness Level (TRL) of 4, corresponding to an operational validation in a controlled environment. The optical architecture of the system can be …

Interleaved Atom Interferometry for High Sensitivity Inertial Measurements

Cold-atom inertial sensors target several applications in navigation, geoscience and tests of fundamental physics. Reaching high sampling rates and high inertial sensitivities, obtained with long interrogation times, represents a challenge for these applications. We report on the interleaved operation of a cold-atom gyroscope, where 3 atomic clouds are interrogated simultaneously in an atom interferometer featuring a 3.75 Hz sampling rate and an interrogation time of 801 ms. Interleaving improves the inertial sensitivity by efficiently averaging vibration noise, and allows us to perform dynami…

Development of compact cold-atom sensors for inertial navigation

Inertial sensors based on cold atom interferometry exhibit many interesting features for applications related to inertial navigation, particularly in terms of sensitivity and long-term stability. However, at present the typical atom interferometer is still very much an experiment---consisting of a bulky, static apparatus with a limited dynamic range and high sensitivity to environmental effects. To be compliant with mobile applications further development is needed. In this work, we present a compact and mobile experiment, which we recently used to achieve the first inertial measurements with …

I.C.E.: An Ultra-Cold Atom Source for Long-Baseline Interferometric Inertial Sensors in Reduced Gravity

The accuracy and precision of current atom-interferometric inertialsensors rival state-of-the-art conventional devices using artifact-based test masses . Atomic sensors are well suited for fundamental measurements of gravito-inertial fields. The sensitivity required to test gravitational theories can be achieved by extending the baseline of the interferometer. The I.C.E. (Interférométrie Cohérente pour l'Espace) interferometer aims to achieve long interrogation times in compact apparatus via reduced gravity. We have tested a cold-atom source during airplane parabolic flights. We show that this…

Dual Matter-Wave Inertial Sensors in Weightlessness

Quantum technology based on cold-atom interferometers is showing great promise for fields such as inertial sensing and fundamental physics. However, the best precision achievable on Earth is limited by the free-fall time of the atoms, and their full potential can only be realized in Space where interrogation times of many seconds will lead to unprecedented sensitivity. Various mission scenarios are presently being pursued which plan to implement matter-wave inertial sensors. Toward this goal, we realize the first onboard operation of simultaneous $^{87}$Rb $-$ $^{39}$K interferometers in the w…

冷原子干涉仪中实时相位控制方法

Real-time phase control methods for cold-atom interferometry

本文提出两种实时惯性相位补偿方法，通过回反射镜位置或拉曼激光频率跃迁实现，与光学相位跃迁方法性能相当，拓展了其在空间应用中的用途。

连续双轴原子干涉惯性传感器

A Continuous Dual-Axis Atomic Interferometric Inertial Sensor

本文提出利用反向传播原子束、二维冷却与三束 Raman 激光的连续双轴原子干涉惯性传感器，实现动态环境下旋转与加速度同时测量，并验证其高精度与长期稳定性。

New concepts of inertial measurements with multi-species atom interferometry

In the field of cold atom inertial sensors, we present and analyze innovative configurations for improving their measurement range and sensitivity, especially attracting for onboard applications. These configurations rely on multi-species atom interferometry, involving the simultaneous manipulation of different atomic species in a unique instrument to deduce inertial measurements. Using a dual-species atom accelerometer manipulating simultaneously both isotopes of rubidium, we report a preliminary experimental realization of original concepts involving the implementation of two atom interferom…

利用亚稳态钡的精细结构拉曼干涉术实现抗磁干扰的惯性传感

Fine-structure Raman interferometry with metastable barium for magnetically resilient inertial sensing

本研究提出基于钡亚稳态精细结构跃迁的拉曼原子干涉仪，大幅降低二次塞曼灵敏度，放宽磁场控制要求，实验实现钡亚稳态间马赫-曾德尔干涉，为抗磁干扰的惯性传感提供关键方案。