Full Counting Statistics with Spin-sensitive Detectors reveals   Spin-singlets
  We study the full counting statistics of electric current to several drain terminals with spin-dependent entrance conductances. We show that the statistics of charge transfers can be interpreted in terms of single electrons and spin-singlet pairs coming from the source. If the source contains transport channels of high transparency, a significant fraction of electrons comes in spin-singlet pairs. 
Antonio Di Lorenzo and Yuli V. Nazarov