Carbon Nanotubes as Cooper Pair Beam Splitters

We report on conductance measurements in carbon nanotube based double quantum dots connected to two normal electrodes and a central superconducting finger. By operating our devices as beam splitters, we provide evidence for Crossed Andreev Reflections $\mathit{\text{tunable}}\mathit{\text{in}}\mathit{\text{situ}}$. This opens an avenue to more sophisticated quantum optics-like experiments with spin entangled electrons.