  We recently argued that a self-propelled particle is formally equivalent to a
system consisting of two subsystems coupled by a non-reciprocal interaction
[Phys. Rev. E 100, 050603(R) (2019)]. Here we show that this non-reciprocal
coupling allows to extract useful work from a single self-propelled particle
maintained at constant temperature, by using an aligning interaction to
influence correlations between the particle's position and self-propulsion.
