Ferri, Francesco

Date:   Tuesday, May 22, 2018
Time:   13:00
Place:  ETH Zurich, Hönggerberg, HPF G 6
Hosts:  Tobias Donner /Tilman Esslinger

Towards a 1D array of single atoms in a fiber cavity for generation of multiparticle entanglement

Francesco Ferri
Laboratoire Kastler Brossel, Paris, France

I will present a new experimental platform that combines methods of optical Cavity Quantum Electrodynamics with quantum gas microscope techniques developed in the field of optical lattices. This experiment is aimed at extending the generation of multi-particle entanglement to mesoscopic ensembles of about 100 neutral atoms while maintaining full control on the single particles. In order to achieve this goal, we are building a single-atom qubit register in a 1D optical lattice, with single-particle detection and addressing capabilities, where each site is strongly and identically coupled to the mode of a high-finesse optical resonator. I will describe the main peculiarities of our compact cold-atom setup, with particular focus on the miniaturized fiber cavity [1]. I will also show our observation of strong atom-cavity coupling through vacuum-Rabi-splitting measurements, as well as the latest results of our effort towards obtaining a chain of single atoms inside the cavity.
This new experimental platform will provide an ideal test-bed to investigate multi-particle entanglement generation in different contexts, such as in Quantum Zeno Dynamics schemes [2] and at the critical point of an effective Dicke model [3], where multi-particle entanglement is expected in the vicinity of the quantum phase transition.

[1] D. Hunger et al., New Jour. Phys. 12, 6 (2010)
[2] G. Barontini et al., Science 349, 6254 (2015)
[3] F. Dimer et al., Phys. Rev. A 75, 013804 (2007)