Hydrodynamics of the interacting Bose gas in the Quantum Newton Cradle setup

Understand

Describing and understanding the motion of quantum gases out of equilibrium is one of the most important modern challenges for theorists.

• In the groundbreaking Quantum Newton Cradle experiment [Kinoshita, Wenger and Weiss, Nature 440, 900, 2006], quasi-one-dimensional cold atom gases were observed with unprecedented accuracy, providing impetus for many developments on the effects of low dimensionality in out-of-equilibrium physics.
• But it is only recently that the theory of generalized hydrodynamics has provided the adequate tools for a numerically efficient description.
• Using it, we give a complete numerical study of the time evolution of an ultracold atomic gas in this setup, in an interacting parameter regime close to that of the original experiment.