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Helium - Lattice

Helium - Lattice

Coordinator: David Clément 

PhD. Students: Gaétan Hercé, Jan-Philipp Bureik

Post-doc fellow: Antoine Tenart

WE HAVE A POST-DOC POSITION OPENING IN 2022 - please contact D. Clément if you may be interested! 

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.



July 2022: our latest paper is online on the arXiv. 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.




May 2022: Jan-Philipp is awarded a prize for his talk at the PhD days of the Doctoral school EDOM. Congrats!! 

April 2022:  We had a great scientific workshop to discuss the most recent advancements in the context of ultracold atom physics and related fields. Experimental and theoretical groups from Palaiseau (France) and Florence (Italy) research areas gathered to present their activities and discuss collaborations in topics ranging from metrology and entanglement to quantum transport and simulation. The scientific program and all the information here:

April 2022: a new preprint about an old story arXiv:2204.10697 - study of the time-of-flight dynamics of Bose polarons. 

November 2021: our observation of Bogoliubov's pairs at opposite momenta in the quantum depletion of an ensemble of interacting bosons is now published in Nature Physics, along with a News and Views by our Australian colleagues S. Hodgman and A. Truscott. 





July 2021: we studied the 3D Mott transition in a trap by combining experimental/theoretical approaches, in collaboration with Tommaso Roscilde. We find traits of the critical behavior expected for the 3D XY universality class of the homogeneous Bose-Hubbard model. This work was published in Physical Review A and selected as Editors' suggestion

May 2021: in a weakly-interacting Bose gas at equilibrium, quantum fluctuations induced by interactions should manifest as pairs of bosons with opposite momenta. We have directly observed these atom pairs, which are also the emblematic microscopic signature of the quantum depletion. Read our preprint here: arXiv:2105.05664 (2021).

January 2021: we investigated the preparation of quantum states of the 3D Bose-Hubbard model by comparing experimental data with Quantum Monte-Carlo calculation performed by T. Roscilde. From estimating the temperature and entropy of the lattice gases, we demonstrate the adiabatic preparation of states in the critical regime of the Mott phase transition. This is published in Physical Review Letters and selected as Editors' suggestion !

January 2021: a theoretical work investigating  atom-atom correlations in an interacting Bose gas treated within the Bogoliubov approximation is published in Physical Review A. Grazie a Giulio e Iacopo!



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, arXiv:2207.14070 (2022).

Fermionic correlation functions from randomized measurements in programmable atomic quantum devices, P. Naldesi, A. Elben, A. Minguzzi, D. Clément, P. Zoller, B. Vermersch, arXiv:2205.00981 (2022).

Observation of 1/k^4-tails in the asymptotic momentum distribution of Bose polarons, H. Cayla, P. Massignan, T. Giamarchi, A. Aspect, C. Westbrook, D. Clément, arXiv:2204.10697 (2022).


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 unitarityC. 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)


Videos by Hugo related to the experiment:

Refroidir les atomes 

La machine



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