Thesis topic: Research of a microwave Feshbach resonance with an ultracold sodium atom gas trapped on an atomic chip - Study of the excitation spectrum of a one-dimensional Bose quantum gas from weak to strong interaction regime.
Quantum gases - Bose-Einstein condensates or Fermi gases - have reached a stage of maturity such that their applications go beyond atomic physics and include quantum metrology, superfluidity, quantum information and quantum simulation in the broader field of quantum technologies. In particular, they have demonstrated their potential to be used as quantum simulators to explore complex quantum problems, thanks to a very high degree of control over their physical parameters: temperature, density, internal state... They can then be used as a model to explore quantum physics at its limits. This is particularly true for small quantum systems where fluctuations play a crucial role, bringing highly correlated configurations within reach of experiments. For example, one-dimensional (1D) quantum gases are being considered to simulate materials on a "quantum scale", which consist of a few coupled 1D systems and could give an indication of the physics of superconductivity at high temperature.
In this context, the purpose of the proposed project is to explore the properties and dynamics of 1D Bose gases with tunable interactions. The 1D gas will be produced near the surface of an atomic chip on which are deposited the gold wires creating the magnetic confinement field. The first part of the thesis will be devoted to the search of a predicted - but not yet observed - microwave Feshbach resonance, which will then be used to tune the atomic interactions and explore the whole phase diagram of the 1D Bose gas.
The "Bose-Einstein Condensates" group of LPL's "Quantum Gases" axis has recognized expertise in the field of quantum gases in reduced dimensions and quantum simulation. It is an active member of SIRTEQ, a consortium bringing together all the groups in the Paris region in the field of quantum technologies.
Le LPL est membre de SIRTEQ, un institut regroupant toutes les équipes travaillant sur les technologies quantiques autour de Paris. L'Institut organise des séminaires, workshops et écoles d'été tout au long de l'année.
Contact : Hélène Perrin