  A quantum engine fueled by quantum measurement is proposed. Under the
finite-time adiabatic driving regime, the conversion of heat to work is
realized without the compression and expansion of the resonance frequency. The
work output, quantum heat, and efficiency are derived, highlighting the
important role of the thermal divergence recently reappearing in open quantum
systems. The key problem of how the measurement basis can be optimized to
enhance the performance is solved by connecting the thermal divergence to the
nonequilibrium free energy and entropy. The spin-engine architecture offers a
comprehensive platform for future investigations of extracting work from
quantum measurement.
