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 đ°u(đ)-symmetric matter.
arXiv:2501.01731 (2025) / PRX Quantum 6, 020352 (2025)
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)
We propose a minimalistic model to account for the main properties of a continuous superradiant laser, in which a beam of atoms crosses the mode of a high-finesse Fabry-Perot cavity, and collectively emits light into the cavity mode.
arXiv:2210.05464 (2022) / SciPost Phys. Core 6, 015 (2023)
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 generatorânamely, the collective spin component along an axis of symmetry.
arXiv:2202.08607 (2022) / Phys. Rev. Lett. 129, 113201 (2022)
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)
We introduce a spin-orbit coupling scheme, where a retroreflected laser beam selectively diffracts two spin components in opposite directions.
arXiv:2003.13444 (2020) / Phys. Rev. A 102, 013317 (2020)
Shelving spectroscopy of the Sr intercombination line; Adiabatic spin-dependent momentum transfer in a degenerate Sr gas
Shelving spectroscopy of the strontium intercombination line
We present a spectroscopy scheme for the 7 kHz wide 689 nm intercombination line of strontium. We rely on shelving detection, where electrons are first excited to a metastable state by the spectroscopy laser before their state is probed using the broad transition at 461 nm.
arXiv:1910.11718 (2019) / J. Phys. B: At. Mol. Opt. Phys. 53 085005 (2020)
Quantum magnetism with cold atoms: 1) dissipative cooling of spin chains 2) birth of the strontium experiment at LPL
