  Addressing the feasibilty of quantum communication with electrons we consider
entangled spin states of electrons in a double-dot which is weakly coupled to
in--and outgoing leads. We show that the entanglement of two electrons in the
double-dot can be detected in mesoscopic transport and noise measurements. In
the Coulomb blockade and cotunneling regime the singlet and triplet states lead
to phase-coherent current and noise contributions of opposite signs and to
Aharonov-Bohm and Berry phase oscillations in response to magnetic fields.
These oscillations are a genuine two-particle effect and provide a direct
measure of non-locality in entangled states. We show that the ratio of
zero-frequency noise to current (Fano factor) is universal and equal to the
electron charge.

Mesoscale and Nanoscale Physics;Quantum Physics