  The power and efficiency of many-body heat engines can be boosted by
performing cooperative non-adiabatic operations in contrast to the commonly
used adiabatic implementations. Here, the key property relies on the fact that
non-adiabaticity is required in order to allow for cooperative effects, that
can use the thermodynamic resources only present in the collective non-passive
state of a many-body system. In particular, we consider the efficiency of an
Otto cycle, which increases with the number of copies used and reaches a
many-body bound, which we discuss analytically.
