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We show how one can implement a quantum heat machine by using two interactingtrapped ions, in presence of a thermal bath. The electronic states of the ionsact like a working substance, while the vibrational mode is modelled as thecold bath. The heat exchange with the cold bath is mimicked by the projectivemeasurement of the electronic states. We show how such measurement in asuitable basis can lead to either a quantum heat engine or a refrigerator, thatundergoes a quantum Otto cycle. The local magnetic field is adiabaticallychanged during the heat cycle. The performance of the heat machine depends uponthe interaction strength between the ions, the magnetic fields, and themeasurement cost. In our model, the coupling to the hot and the cold baths arenever switched off in an alternative fashion during the heat cycle, unlikeother existing proposals of quantum heat engines. This makes our proposalexperimentally realizable using current tapped-ion technology.

Measurement-induced operation of two-ion quantum heat machines