Controlled persistent current transport between toroidal quantum gases

Realizing transport of quantized vorticity between ring-shaped atomic Bose-Einstein condensates could be a key step in diverse cold atom quantum technologies and atomtronic devices. In this work we present recent results on the deterministic transfer of persistent current between co-planar rings of cold atoms, creating a prototype atomtronic switch through a tunable weak link at the common interface of two density-coupled rings. We explicitly demonstrate such transfer with the presence of both rotation and linear translation, within the context of pure mean-field simulations (Gross-Pitaevskii equation) and examine the sensitivity of this process to finite-temperature fluctuations (by self-consistently coupling the dissipative Gross-Pitaevskii equation to a quantum Boltzmann equation for the thermal cloud, known as the Zaremba-Nikuni-Griffin method). These investigations open perspectives for the development of a novel type of quantum sensor based on angular momentum transfer in atomtronic circuits.