LPL - Laboratoire de Physique des Lasers

Quantum Gases: presentation

The activity of the Quantum Gases axis, within the two teams Bose-Einstein Condensates (BEC) and Magnetic Quantum Gases (GQM), is part of a worldwide effort to study the transport and magnetic properties of quantum degenerate Bose and Fermi gases. Because of the very clean, controlled and isolated environment in these systems, it is forecast that cold atom experiments can shed new light on quantum many-body physics, and provide quantum simulators of open questions inherited from condensed matter physics. In this context, the cold atom groups at LPL have developed five experimental setups with four different atomic species to provide an original point of view on various quantum physics issues, such as quantum magnetism, superfluid dynamics, and open quantum systems. The Quantum Gases axis also develops a theory activity in synergy with the experimental projects.

Bose-Einstein Condensates (BEC)

> Composition of the team

> Thesis

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> Bose-Einstein Condensates - Rubidium

Our group is expert in the manipulation of quantum gases in adiabatic traps, obtained by combining static and radio-frequency magnetic fields. Our current research concerns the superfluity of quantum gases confined in a hollow sphere (bubble) trap.

 

> Bose-Einstein Condensates - Sodium

This experiment produces a 1D quantum gas of sodium, on a chip. Radio-frequency and microwave fields are included on the chip to manipulate the degenerate gas, and study its out-of-equilibrium dynamics.

 

Magnetic Quantum Gases (GQM)

> Composition of the team

> Thesis

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> Magnetic quantum gases - Chromium

We study quantum dipolar gases made of Chromium atoms. The originality of our experiments lie in the strong long-range and anisotropic dipole-dipole interactions between atoms. We study in particular how these interactions drive the magnetic properties of the ensemble of Chromium atoms, either in the BEC phase, or when they are localized in an optical lattice.

 

> Magnetic quantum gases - Strontium

This experiment produces degenerate quantum gases of fermionic strontium atoms, for the study of quantum magnetism in optical lattices. We use the narrow optical lines of strontium to develop measurement and manipulation protocols of the quantum state of the ensemble of spin-9/2 atoms.


> Magnetic quantum gases - Superradiant Laser

This experiment is devoted to the collective spontaneous emission (superradiance) of a cold atomic beam passing through an optical cavity. We aim at at characterizing the collective phenomena between atomic emitters, resulting in superradiant emission, and at demonstrating continuous emission, such that this light source could act as a novel kind of optical clock.

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