A new innovative proof-of-concept quantum Otto cycle, using nuclear spins, has touched an efficiency near to its thermodynamic limit at supreme power. The new quantum technology relies on microscopic devices that follow the fundamentals of quantum mechanics. The theoretical notion of a quantum heat engine was first introduced sixty years ago, when Scovil and Schulz-DuBois at Bell Labs (USA), made an analogy between three-level masers and thermal machines. The quantum spin engine would not be very beneficial in practice since the work produced would supply a very small amount of energy to radio waves that it would only be sufficient to alter another nuclear spin.
