Driving Interactions Efficiently in a Composite Few-Body System

• Main Authors: Alan Kahan, Thomás Fogarty, Jing Li, Thomas Busch
• Format: Article
• Language: English
• Published: MDPI AG 2019-10-01
• Series: Universe
• Subjects: shortcuts to adiabaticity; cold atoms; few-body systems
• Online Access: https://www.mdpi.com/2218-1997/5/10/207

We study how to efficiently control an interacting few-body system consisting of three harmonically trapped bosons. Specifically, we investigate the process of modulating the inter-particle interactions to drive an initially non-interacting state to a strongly interacting one, which is an eigenstate of a chosen Hamiltonian. We also show that for unbalanced subsystems, where one can individually control the different inter- and intra-species interactions, complex dynamics originate when the symmetry of the ground state is broken by phase separation. However, as driving the dynamics too quickly can result in unwanted excitations of the final state, we optimize the driven processes using shortcuts to adiabaticity, which are designed to reduce these excitations at the end of the interaction ramp, ensuring that the target eigenstate is reached.