Spectroscopy of non-local superconducting correlations in a double   quantum dot
  We investigate non-linear transport in a double quantum dot connected to two normal electrodes and a central superconducting finger. By this means, we perform a transport spectroscopy of such a system which implements a Cooper pair splitter. The non-linear conductance exhibits strong subgap features which can be associated with the coherence of the injected Cooper pairs. Our findings are well accounted for by the recently developed microscopic theory of Cooper pairs splitters made in SWNTs. 
L. G. Herrmann, P. Burset, W. J. Herrera, F. Portier, P. Roche, C.   Strunk, A. Levy Yeyati and T. Kontos
cond-mat.mes-hall cond-mat.str-el cond-mat.supr-con