  The electrons forming a Cooper pair in a superconductor can be spatially
separated preserving their spin entanglement by means of quantum dots coupled
to both the superconductor and independent normal leads. We investigate the
thermoelectric properties of such a Cooper pair splitter and demonstrate that
cooling of a reservoir is an indication of non-local correlations induced by
the entangled electron pairs. Moreover, we show that the device can be operated
as a non-local thermoelectric heat engine. Both as a refrigerator and as a heat
engine, the Cooper pair splitter reaches efficiencies close to the
thermodynamic bounds. As such, our work introduces an experimentally accessible
heat engine and a refrigerator driven by entangled electron pairs in which the
role of quantum correlations can be tested.
