Feedback cooled Bose-Einstein condensation: near and far from equilibrium
POSTER
Abstract
Continuously measured interacting quantum systems almost invariably heat, causing loss of quantum coherence. We study Bose-Einstein condensates (BECs) subject to repeated weak measurement of the atomic density and describe several protocols for generating a feedback signal designed to remove excitations created by measurement backaction. We use a stochastic Gross-Pitaevskii equation to model the system dynamics and develop feedback protocols that effectively cool both 1D and 2D BECs. Furthermore, we use this protocol to quench-cool 1D BECs from non-condensed highly excited states and find that they rapidly condense into a far from equilibrium state. We observe that these quench-cooled condensed states can have non-zero integer winding numbers described by quantized supercurrents.
*This work was partially supported by the National Institute of Standards and Technology, and the National Science Foundation through the Quantum Leap Challenge Institute for Robust Quantum Simulation (grant OMA2120757).
Publication: Yamaguchi, E. P., Hurst, H. M., & Spielman, I. B. (2022). Feedback cooled Bose-Einstein condensation: near and far from equilibrium. arXiv preprint arXiv:2206.04156.
Presenters
-
Evan P Yamaguchi
- The Pritzker School of Molecular Engineering, University of Chicago