  The reversible nature of thermodynamical cycles is an idealisation based on
the assumption of perfect quasi-static dynamics. As a consequence of this
assumption, ideal engines operate at the maximum efficiency but have zero
power. Realistic engines, on the other hand, operate in finite-time and are
intrinsically irreversible, implying friction effects at short cycle times. The
engineering goal is to find the maximum efficiency allowed at the maximum
possible power. In the current technological age, with our ability to
manipulate devices at the nanoscale and beyond, one must understand the
consequences of engines which operate at the quantum mechanical level. In this
domain one cannot avoid the emergence of both quantum and thermal fluctuations
which drastically alter the energetics of the cycle. Very recently, it has been
shown that the Hamiltonian of a quantum system may be manipulated in such a way
as to mimic an adiabatic process via a non-adiabatic shortcut. A surge of
experimental progress has demonstrated several of these proposals in the
laboratory. In this paper we show that, by utilising shortcuts to adiabaticity
in a quantum engine cycle, one can engineer a thermodynamical cycle working at
finite power and zero friction. Our findings are elucidated using a harmonic
oscillator undergoing a quantum Otto cycle.
