Author(s): Antonio Patrón Castro, John Bechhoefer, and David A. Sivak We study the optimal performance of an information engine consisting of an overdamped Brownian bead confined in a controllable, d -dimensional harmonic trap and additionally subjected to gravity. The trap’s center is updated dynamically via a feedback protocol designed such that no external work is d… [Phys. Rev. Lett. 136, 047101] Published Tue Jan 27, 2026