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We investigate quantum coherence of electron spin transported through asemiconductor spintronic device, where spins are envisaged to be controlled byelectrical means via spin-orbit interactions. To quantify the degree of spincoherence, which can be diminished by an intrinsic mechanism where spin andorbital degrees of freedom become entangled in the course of transportinvolving spin-orbit interaction and scattering, we study the decay of theoff-diagonal elements of the spin density matrix extracted directly from theLandauer transmission matrix of quantum transport. This technique is applied tounderstand how to preserve quantum interference effects of fragilesuperpositions of spin states in ballistic and non-ballistic multichannelsemiconductor spintronic devices.Comment: 7 pages, 3 color EPS figures, prepared for Proceedings of  International Symposium on Mesoscopic Superconductivity and Spintronics 2004  (Atsugi, Japan, March 1-4, 2004

CONTROLLING DECOHERENCE OF TRANSPORTED QUANTUM SPIN INFORMATION IN SEMICONDUCTOR SPINTRONICS