Permanent staff: Thomas Chalopin, David Clément
PhD students: Maxime Allemand, Géraud Dupuy, Paul Paquiez
Interns: we are welcoming applications for internship (this includes a Master 2 offer - see below) !
We have built an apparatus to manipulate metastable Helium atoms (He*) loaded in optical lattices and to measure atom-atom correlations in many-body quantum states. The special properties of He*, its light mass and its large internal energy, enable an original and innovative detection method which can reconstruct the three dimensional positions of and correlations between individual atoms after a long time of free fall, providing direct access to momentum-space correlations.
January 2025: our latest work has been published in Nature Physics (here). It reports the suppression of Bogoliubov pairing and the observation of non-Gaussian correlations induced by interactions. In particular we have monitored the connected two-body correlations at opposite momenta, revealing a non-monotonic behavior.
November 2024: our paper on the detector tomography has been published in PRX Quantum, congratulations everyone!
September 2024: Paul Paquiez is starting a PhD in our team, welcome Paul !!
May 2024: we worked on the characterisation of our single-atom detector and applied approaches from quantum detector tomography, with some modification to account for the shot-to-shot fluctuations to the total atom number. Read our new preprint if you are interested : arxiv:2405.01211 (2024)
January 2024: Thomas Chalopin is joining the Lattice Helium team with a permanent CNRS position!! Welcome Thomas!!
April 2023: we have published a puzzling observation in Phys. Rev. Lett., for which we have yet no clue about its microscopic origin: algebraic tails 1/k^4 in the time-of-flight distributions of Bose-Einstein condensates in the presence of impurities. Many thanks to our theory collaborators Pietro and Thierry!
March 2023: we published a Letter in Phys. Rev. Research. Here we exploit the single-atom-resolved detection method to measure correlations between up to 6 individual atoms! We characterize emblematic states like BECs and Mott insulators with unprecedented resolution, obtaining new information.
January 2023: Antoine received one of the Best PhD prize from the Doctoral School EDOM (link), congrats !!
Quantifying two-mode entanglement of bosonic Gaussian states from their full counting statistics, V. Gondret, C. Lamirault, R. Dias, C. Leprince, C. I. Westbrook, D. Clément, D. Boiron, arxiv:2503.09555 (2025).
Suppression of Bogoliubov momentum pairing and emergence of non-Gaussian correlations in ultracold interacting Bose gases, J.-P. Bureik, G. Hercé, M. Allemand, A. Tenart, T. Roscilde, D. Clément, Nature Physics 21, 57-62 (2025).
Tomography of a single-atom-resolved detector in the presence of shot-to-shot number fluctuations, M. Allemand, R. Jannin, G. Dupuy, J.-P. Bureik, L. Pezzè, D. Boiron, D. Clément, Phys. Rev. X Quantum 5, 040324 (2024).
Non-Gaussian correlations in the steady-state of driven-dissipative clouds of two-level atoms, G. Ferioli, S. Pancaldi, A. Glicenstein, D. Clément, A. Browaeys, I. Ferrier-Barbut, Phys. Rev. Lett. 132, 133601 (2024).
Observation of 1/k^4-tails after expansion of Bose-Einstein Condensates with impurities, H. Cayla, P. Massignan, T. Giamarchi, A. Aspect, C. Westbrook, D. Clément, Phys. Rev. Lett. 130, 153401 (2023).
Full counting statistics of interacting lattice gases after an expansion: quantifying many-body coherence from atom correlations, G. Hercé, J.-P. Bureik, A. Ténart, A. Aspect, A. Dareau, D. Clément, Phys. Rev. Research 5, L012037 (2023).
Fermionic correlation functions from randomized measurements in programmable atomic quantum devices, P. Naldesi, A. Elben, A. Minguzzi, D. Clément, P. Zoller, B. Vermersch, Phys. Rev. Lett. 131, 060601 (2023).
Observation of pairs of atoms at opposite momenta in an equilibrium interacting Bose gas, A. Tenart, G. Hercé, J.-P. Bureik, A. Dareau, D. Clément, Nature Physics 17, 1364–1368 (2021). - see accompagnying News and Views.
Studying the low-entropy Mott transition of bosons in a three-dimensional optical lattice by measuring the full momentum-space density, G. Hercé, C. Carcy, A. Tenart, J.-P. Bureik, A. Dareau, D. Clément, T. Roscilde, Physical Review A 104, L011301 (2021) - selected as Editors' suggestion.
Certifying the adiabatic preparation of ultracold lattice bosons in the vicinity of the Mott transition, C. Carcy, G. Hercé, A. Tenart, T. Roscilde and D. Clément, Phys. Rev. Lett. 126, 045301 (2021) - selected as Editors' suggestion.
Position- and momentum-space two-body correlations in a weakly interacting trapped condensate, S. Butera, D. Clément, I. Carusotto, Phys. Rev A 103, 013302 (2021).
Hanbury-Brown and Twiss bunching of phonons and of the quantum depletion in an interacting Bose gas, H. Cayla, S. Butera, C. Carcy, A. Tenart, G. Hercé, M. Mancini, A. Aspect, I. Carusotto, D. Clément, Phys. Rev. Lett. 125, 165301 (2020).
Two-body collisions in the time-of-flight dynamics of lattice Bose superfluids, A. Tenart, C. Carcy, H. Cayla, T. Bourdel, M. Mancini, D. Clément, Phys. Rev. Research 2, 013017 (2020) - selected as Editors' suggestion.
Momentum-space atom correlations in a Mott insulator, C. Carcy, H. Cayla, A. Tenart, A. Aspect, M. Mancini, D. Clément, Phys. Rev. X 9, 041028 (2019).
Contact and sum-rules in a near-uniform Fermi gas at unitarity, C. Carcy, S. Hoinka, M. G. Lingham, P. Dyke, C. C. N. Kuhn, H. Hu, C. Vale, Phys. Rev. Lett. 122, 203401 (2019).
Tan's Contact for Trapped Lieb-Liniger Bosons at Finite Temperature, H. Yao, D. Clément, A. Minguzzi, P. Vignolo, L. Sanchez-Palencia Phys. Rev. Lett. 121, 220402 (2018).
Single-atom-resolved probing of lattice gases in momentum space, H. Cayla, C.Carcy, Q. Bouton, R. Chang, G. Carleo, M. Mancini, D. Clément, Phys. Rev. A 97 061609(R) (2018)
Quantum depletion of a homogeneous Bose-Einstein condensate , R. Lopes, C. Eigen, N. Navon, D. Clément, R. P. Smith, Z. Hadzibabic, Phys. Rev. Lett. 119, 190404 (2017).
Momentum-resolved observation of thermal and quantum depletion in an interacting Bose gas, R. Chang, Q. Bouton, H. Cayla, C. Qu, A. Aspect, C. I. Westbrook, D. Clément, Phys. Rev. Lett. 117, 235303 (2016).
Characterization of a detector chain using a FPGA-based Time-to-Digital Converter to reconstruct the three-dimensional coordinates of single particles at high flux, F. Nogrette, D. Heurteau, R. Chang, Q. Bouton, C. I. Westbrook, R. Sellem, D. Clément, Rev. Scient. Intrum. 86, 113105 (2015)
Fast production of Bose-Einstein condensates of metastable Helium, Q. Bouton, R. Chang, L. Hoendervanger, F. Nogrette, A. Aspect, C. I. Westbrook, D. Clément Phys. Rev. A 91 061402(R) (2015)
Dynamical structure factor of one-dimensional Bose gases: experimental signatures of beyond-Luttinger liquid physics, N. Fabbri, M. Panfil, D. Clément, L. Fallani, M. Inguscio, C. Fort and J.-S. Caux, Phys. Rev. A 91, 043617 (2015)
Three-dimensional laser cooling at the Doppler limit, R. Chang, A.L. Hoendervanger, Q. Bouton, Y. Fang, T. Klafka, K. Audo, A. Aspect, C. I .Westbrook and D. Clément Phys. Rev. A 90 063407 (2014) [selected as Editors's suggestion]
Influence of Gold Coating and Interplate Voltage on the Performance of Chevron Micro-Channel Plates for the Temporally and Spatially Resolved Single Particle Detection, A.L. Hoendervanger, D. Clément, A. Aspect, C.I. Westbrook, D. Dowek, Y. Picard and D. Boiron Rev. Scient. Instrum. 84 023307 (2013)
An oscillator circuit to produce a radio-frequency discharge and application to metastable helium saturated absorption spectroscopy, F. Moron, A.L. Hoendervanger, M. Bonneau, Q. Bouton, A. Aspect, D. Boiron, D. Clément and C.I. Westbrook, Rev. Scient. Instrum. 83 044705 (2012)
