Baptiste Allard

Maitre de conférences

Laboratoire IRSAMC-LCAR 

Université de Toulouse, Department of Physics 


Phone: +33 5 61 55 84 92



My research activities now focus on metrology measurements with degenerate atomic ensembles and separated arms interferometers. The goal is to improve the performance of atom interferometers by using Bose-Einstein condensates with applications for fundamental physics tests.


Key words : Bose-Einstein condensates, Atom interferometry, High precision measurements.


Short CV


I did my PhD at the Institut d’Optique under the supervision of P. Bouyer and T. Bourdel.  I worked on the effect of a correlated disorder on the conduction and thermodynamics properties of two-dimensional degenerated Bose gases.

My PhD has been followed by a 4-year postdoctoral stay in the group of Pr. P. Treutlein at the University of Basel. My project was to study correlations on atomic spin-squeezed states. We have demonstrated Bell correlations on a ensemble of 480 Rubidium atoms using a new measurement protocol.

I have been recruited as assistant professor in the atom interferometry group at LCAR in Sept 2016. We are currently building a new atom interferometer based on Bose-Einstein condensates and large-momentum transfer techniques.






A. Béguin, T. Rodzinka, L. Calmels, B. Allard, A. Gauguet, Atom interferometry with coherent enhancement of Bragg pulse sequences. Physical Review Letters 131, 143401 (2023)


S. Abend et. al., Technology roadmap for cold-atoms based quantum inertial sensor in space.  AVS Quantum Sci 5, 019201 (2023).


A. Béguin, T. Rodzinka, J. Vigué, B. Allard, and A. Gauguet, Characterization of an atom interferometer in the quasi-Bragg regime. Physical Review A 105, 033302 (2022).


B. Décamps, M. Bordoux, J. Alibert, B. Allard, and A. Gauguet, Phase response of atom interferometers based sequential Bragg diffraction. Journal of Physics B: Atomic, Molecular and Optical Physics 52, 015003 (2019).


J. Alibert, B. Décamps, M. Bordoux, B. Allard, and A. Gauguet, A millimeter magnetic trap for a dual (85Rb and 87Rb) species atom interferometer. Review of Scientific Instruments 88, 113115 (2017).


B. Allard, M. Fadel, R. Schmied, and P. Treutlein, Sideband Rabi spectroscopy of finitetemperature trapped Bose gases. Physical Review A 93, 043624 (2016).


R. Schmied, J.-D. Bancal, B. Allard, M. Fadel, V. Scarani, P. Treutlein, and N. Sangouard, Bell Correlations in a Bose-Einstein Condensate. Science 352, 441 (2016).


B. Allard, T. Plisson, M. Holzmann, G. Salomon, A. Aspect, P. Bouyer, and T. Bourdel, Effect of disorder close to the superfluid transition in a two-dimensional Bose gas. Physical Review A. 85, 033602 (2012).


T. Plisson, B. Allard, M. Holzmann, G. Salomon, A. Aspect, P. Bouyer, and T. Bourdel, Coherence properties of a 2D trapped Bose gas around the superfluid transition. Physical Review A. 84, 061606(R) (2011).


L. Pezze, M. Robert-de-Saint-Vincent, T. Bourdel, J.-P. Brantut, B. Allard, T. Plisson, A. Aspect, P. Bouyer, and L. Sanchez-Palencia. Regimes of classical transport of cold gases in a two-dimensional anisotropic disorder. New Journal of Physics 13, 095015 (2011).


M. Robert-de-Saint-Vincent, J.-P. Brantut, B. Allard, T. Plisson, L. Pezze, L. Sanchez-Palencia, A. Aspect, T. Bourdel, and P. Bouyer. Anisotropic 2D diffusive expansion of ultracold atoms in a disordered potential. Physical Review Letter 104, 220602 (2010).


G. Stern, B. Allard, M. Robert-de-Saint-Vincent, J.-P. Brantut, B. Battelier, T. Bourdel, and P. Bouyer. Frequency doubled 1534 nm laser system for potassium laser cooling. Applied Optics, Vol. 49 Issue 16, pp.3092-3095 (2010).