  Optimizing the performance of thermal machines is an essential task of
thermodynamics. We here consider the optimization of information engines that
convert information about the state of a system into work. We concretely
introduce a generalized finite-time Carnot cycle for a quantum information
engine and optimize its power output in the regime of low dissipation. We
derive a general formula for its efficiency at maximum power valid for
arbitrary working media. We further investigate the optimal performance of a
qubit information engine subjected to weak energy measurements.

Quantum Physics;Statistical Mechanics