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A Cooper pair splitter consists of a central superconducting contact, S, fromwhich electrons are injected into two parallel, spatially separated quantumdots (QDs). This geometry and electron interactions can lead to correlatedelectrical currents due to the spatial separation of spin-singlet Cooper pairsfrom S. We present experiments on such a device with a series of bottom gates,which allows for spatially resolved tuning of the tunnel couplings between theQDs and the electrical contacts and between the QDs. Our main findings aregate-induced transitions between positive conductance correlation in the QDsdue to Cooper pair splitting and negative correlations due to QD dynamics.Using a semi-classical rate equation model we show that the experimentalfindings are consistent with in-situ electrical tuning of the local andnonlocal quantum transport processes. In particular, we illustrate how thecompetition between Cooper pair splitting and local processes can be optimizedin such hybrid nanostructures.

Local electrical tuning of the nonlocal signals in a Cooper pair splitter