Permanent staff: Thomas Chalopin, David Clément
PhD students: Géraud Dupuy, Paul Paquiez, Henri Coquinot
Interns: Lou Boislaville, Chloé Delaroche, Francesca Di Masi, Shanya Mishra, Ignacy Stachura
Helium - Lattice
Helium - Lattice
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.
News
July 2026: our paper reporting the observation of non-Gaussian statistics of an order parameter across a continuous phase transition is now published in Nature (here).
July 2026: Géraud defends his PhD and becomes a doctor, congrats!
May 2026: we host our colleagues from Italy for the second edition of the Palaiseau-Florence workshop on ultracold atoms. We had great discussions and a great time!
February 2026: our paper on connected correlations in now published in Comptes Rendus - Physique here!
December 2026: Maxime defends his PhD and receives a PhD prize from Université Paris Saclay - congrats!
November 2025: great discussions at Institut d'Optique led us (Browaeys, Chalopin, Clément, Ferrier-Barbut and Lahaye) to write an article about connected correlations and their interest for cold atom experiments - see preprint here.
October 2025: Henri Coquinot is starting a PhD in our team, welcome Henri !!
October 2025: with Jérome and Raphael from Laboratoire Kaster-Brossel, we have co-organised the annual meeting of the GDR Quantum Gases at Institut d'Optique
September 2025: our team has observed the universal non-Gaussian regime across a continuous phase transition from measuring the full probability distribution of the order parameter. This work, done in collaboration with N. Dupuis (Paris), A. Rançon (Lille) and T. Roscilde (Lyon), is now on the arxiv (here).
September 2025: our work on entanglement between two Gaussian bosonic modes in collaboration with the Quantum Atom Optics team of C. Westbrook and D. Boiron is now published in Physical Review Letters (here) !
Mai 2025: we had an interesting workshop on correlations in complex systems
Mars 2025: two new interns are joining the team, welcome Jeanne and Henry !
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 !!
Publications
2026
2026
Observation of universal non-Gaussian statistics of the order parameter across a continuous phase transition, M. Allemand, G. Dupuy, P. Paquiez, N. Dupuis, A. Rançon, T. Roscilde, T. Chalopin, D. Clément, Nature (2026).
Connected correlations in cold atom experiments, T. Chalopin, I. Ferrier-Barbut, T. Lahaye, A. Browaeys and D. Clément, Comptes Rendus. Physique, 27, 65-89 (2026).
2025
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, Phys. Rev. Lett. 135, 100201 (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).
2024
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).
2023
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).
2021
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).
2020
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.
2019
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).
2018
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)
2017
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).
2016
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).
2015
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)
2014
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]
2013
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)
2012
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)
Videos
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