List of all the group’s publications

Coherent control over the high-dimensional space of the nuclear spin of alkaline-earth atoms
16/06/2025
Andrea Litvinov, Benjamin Pasquiou, Bruno Laburthe-Tolra, Etienne Maréchal, Husain Ahmed, John H. Huckans, Martin Robert-de-Saint-Vincent, Pauline Guesdon
We demonstrate coherent manipulation of the nuclear degrees of freedom of ultracold ground-state strontium-87 atoms, thus providing a toolkit for fully exploiting the corresponding large Hilbert space as a quantum resource and for quantum simulation experiments with 𝔰u(𝑁)-symmetric matter. arXiv:2501.01731 (2025) / PRX Quantum 6, 020352 (2025)
Effective light-induced Hamiltonian for atoms with large nuclear spin
07/10/2024
Domantas Burba, Emilia Witkowska, Gediminas Juzeliūnas, Hubert Dunikowski, Martin Robert-de-Saint-Vincent
In this paper, we present a systematic derivation of the effective Hamiltonian for the nuclear spin states of ultracold fermionic atoms due to such an off-resonance light. We obtain compact expressions for the scalar, vector, and tensor light shifts taking into account both linear and quadratic contributions to the hyperfine splitting. arXiv:2404.12429 (2024) / Phys. Rev. Research 6, 033293 (2024)
Method to discriminate between localized and chaotic quantum systems
20/07/2023
Bruno Laburthe-Tolra, Youssef Aziz Alaoui
We study whether a generic isolated quantum system initially set out of equilibrium can be considered as localized close to its initial state. Our approach considers the time evolution in the Krylov basis, which maps the dynamics onto that of a particle moving in a one-dimensional lattice where both the energy in the lattice sites and the tunneling from one lattice site to the next are inhomogeneous. arXiv:2307.10706 (2023) / Phys. Rev. Research 6, 043045 (2024)
Measuring correlations from the collective spin fluctuations of a large ensemble of lattice-trapped dipolar spin-3 atoms
06/07/2022
Ana Maria Rey, Bihui Zhu, Bruno Laburthe-Tolra, Laurent Vernac, Sean Robert Muleady, Tommaso Roscilde, William Dubosclard, Youssef Aziz Alaoui
We perform collective spin measurements to study the buildup of two-body correlations between ≈10^4 spin s=3 chromium atoms pinned in a 3D optical lattice. arXiv:2201.07277 (2022) / Phys. Rev. Lett. 129, 023401 (2022)
Scalable spin squeezing from spontaneous breaking of a continuous symmetry
17/02/2022
Fabio Mezzacapo, Martin Robert-de-Saint-Vincent, Tommaso Comparin, Tommaso Roscilde
Spontaneous symmetry breaking is a property of Hamiltonian equilibrium states which, in the thermodynamic limit, retain a finite average value of an order parameter even after a field coupled to it is adiabatically turned off. In the case of quantum spin models with continuous symmetry, we show that this adiabatic process is also accompanied by the suppression of the fluctuations of the symmetry generator—namely, the collective spin component along an axis of symmetry. arXiv:2202.08607 (2022) / Phys. Rev. Lett. 129, 113201 (2022)
Measuring densities of cold atomic clouds smaller than the resolution limit
08/09/2021
Andrea Litvinov, Bruno Laburthe-Tolra, Etienne Maréchal, John H. Huckans, Martin Robert-de-Saint-Vincent, Olivier Gorceix, Paolo Pedri, Pierre Bataille
We propose and demonstrate an experimental method to measure by absorption imaging the size and local column density of a cloud of atoms, even when its smallest dimension is smaller than the resolution of the imaging system. arXiv:2105.10296 (2021) / Physical Review A 104, 033309 (2021)