  We study shot noise for spin-polarized currents and entangled electron pairs
in a four-probe (beam splitter) geometry with a local Rashba spin-orbit (s-o)
interaction in the incoming leads. Within the scattering formalism we find that
shot noise exhibits Rashba-induced oscillations with continuous bunching and
antibunching. We show that entangled states and triplet states can be
identified via their Rashba phase in noise measurements. For two-channel leads
we find an additional spin rotation due to s-o induced interband coupling which
provides enhanced spin control. We show that the s-o interaction determines the
Fano factor which provides a direct way to measure the Rashba coupling constant
via noise.
