PhD defense: Pierre Bataille
Congratulations to Pierre Bataille for his PhD defense! The first on the Sr1 project.
Correlations and linewidth of the atomic beam continuous superradiant laser
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)
Seminar: Physikalisches Institut der Universität Heidelberg
Large Spin Atoms
PhD defense: Youssef Aziz Alaoui
Congratulations to Youssef Aziz Alaoui for his PhD defense!
Measuring correlations from the collective spin fluctuations of a large ensemble of lattice-trapped dipolar spin-3 atoms
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)
Vacuum chamber assembly
The superradiant laser optical cavity spacer has been made and polished by the laboratory optician Thierry Billeton. Furthermore, the vacuum system is now assembled, but for the cavity.
New arrival: Thomas Lauprêtre
Welcome to Thomas Lauprêtre, starting his post-doctoral research on the chromium project!
New arrival: Ziyad Amodjee
Welcome to Ziyad Amodjee, the first post-doctoral researcher joining the superradiant laser experiment!
Scalable spin squeezing from spontaneous breaking of a continuous symmetry
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)
Coherent control of the SU(10) spin
We have achieved coherent control of the SU(10) spin, with the implementation of adiabatic transfer between selected spin states in the degenerate gas. This puts us one step closer to exploring the emergence of correlations in our system, following the ideas developed in our collaboration with T. Roscilde and his team.