The practical untenability of the quasi-static assumption makes any realistic engine intrinsically irreversible and its operating time finite, thus implying friction effects at short cycle times.

An important technological goal is thus the design of maximally efficient engines working at the maximum possible power.

We show that, by utilising shortcuts to adiabaticity in a quantum engine cycle, one can engineer a thermodynamic cycle working at finite power and zero friction. Our findings are illustrated using a harmonic oscillator undergoing a quantum Otto cycle….

… Read more at www.nature.com

Read also: **Physicists design zero-friction quantum engine**

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