Coherent seeding of the dynamics of a spinor Bose-Einstein condensate: from quantum to classical behavior

no code implementations • 17 Jan 2021 • Bertrand Evrard, An Qu, Jean Dalibard, Fabrice Gerbier

We present experiments revealing the competing effect of quantum fluctuations and of a coherent seed in the dynamics of a spin-1 Bose-Einstein condensate, and discuss the relevance of a mean-field description of our system.

Quantum Gases

Probing spin correlations in a Bose-Einstein condensate near the single atom level

no code implementations • 20 Apr 2020 • An Qu, Bertrand Evrard, Jean Dalibard, Fabrice Gerbier

Using parametric conversion induced by a Shapiro-type resonance, we produce and characterize a two-mode squeezed vacuum state in a sodium spin 1 Bose-Einstein condensate.

Quantum Gases Quantum Physics

Probing chiral edge dynamics and bulk topology of a synthetic Hall system

no code implementations • 6 Jan 2020 • Thomas Chalopin, Tanish Satoor, Alexandre Evrard, Vasiliy Makhalov, Jean Dalibard, Raphael Lopes, Sylvain Nascimbene

Quantum Hall systems are characterized by the quantization of the Hall conductance -- a bulk property rooted in the topological structure of the underlying quantum states.

Quantization Quantum Gases Quantum Physics