  Splitting of Cooper pairs has recently been realized experimentally for
s-wave Cooper pairs. A split Cooper pair represents an entangled two-electron
pair state which has possible application in on-chip quantum computation.
Likewise the spin-activity of interfaces in nanoscale tunnel junctions has been
investigated theoretically and experimentally in recent years. However, the
possible implications of spin-active interfaces in Cooper pair splitters so far
have not been investigated. We analyse the current and the cross correlation of
currents in a superconductor ferromagnet beamsplitter including spin-active
scattering. Using the Hamiltonian formalism we calculate the cumulant
generating function of charge transfer. As a first step, we discuss
characteristics of the conductance for crossed Andreev reflection in
superconductor ferromagnet beamsplitters with s-wave and p-wave superconductors
and no spin-active scattering. In a second step, we consider spin-active
scattering and show how to realize p-wave splitting only using a s-wave
superconductor via the process of spin-flipped crossed Andreev reflection. We
present results for the conductance and cross correlations. Spin-activity of
interfaces in Cooper pair splitters allows for new features in ordinary s-wave
Cooper pair splitters, that can otherwise only be realised by using p-wave
superconductors. In particular it provides access to Bell states different from
the typical spin singlet state.
