Quantum sensors appear today as promising candidates for next generation geodesy missions, owing to their improved long-term stability, which in principle can significantly reduce errors in geoid determination or the study of large-scale mass transport processes. Over the last ten years, LTE has been involved in different studies on the benefit of deploying quantum inertial sensors in space, with a focus on instrument and mission design studies and simulations. Beyond all these activities, there is also a need for in-the-lab validation of the key concepts for the operation of such a sensor in space, which we propose to address within this PhD project.

The objective of the thesis project is to perform in-the-lab validation of key methods for measuring non-gravitational accelerations on board satellites and for dealing with the large rotation rate of the satellite when pointing Nadir. We propose to develop an optical test-bed for the evaluation of the key parameters (linearity, stability, time response …) of a commercial mirror control system that allows for piston and tip-tilt motions. In a second step, we propose to implement this system in a state of the art platform, being a dual gravity sensor that performs measurements of both the gravity acceleration and its gradient. There, we will validate the acceleration measurement principle, based on a mid-fringe lock method, with time-varying accelerations generated thanks to our control of the interferometer laser phase. We will also validate the methods envisioned in calibration sessions, aimed at the determination of the kinetic parameters of the source (position with respect to the center of mass, mean velocities and temperature), which are necessary for the correction of rotation-related acceleration contributions (Coriolis, centrifugal and Euler). 

Last, we will demonstrate hybridization algorithms, based on the combination of quantum and classical sensors, and on the knowledge of applied rotations, which are relevant for on-board sensors not only on satellite platforms but also on planes or ships.

This work will validate some of the measurement concepts envisioned for the operation of quantum sensors in space, beyond activities based on modelling and simulation. Having at hand the LTE gradiometer as a platform will allow to extent the scope of these methods to differential accelerometry, which is highly relevant for potential future missions based on the operation of on-board gradiometers. 

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For more Information about the topics and the co-financial partner (found by the lab!); contact Directeur de thèse - franck.pereira@obspm.fr

Then, prepare a resume, a recent transcript and a reference letter from your M2 supervisor/ engineering school director and you will be ready to apply online before March 13th, 2026 Midnight Paris time!