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We study adiabatic population transfer between discrete positions. Beingclosely related to STIRAP in optical systems, this transport is coherent androbust against variations of experimental parameters. Thanks to theseproperties the scheme is a promising candidate for transport of quantuminformation in quantum computing. We study the effects of spatially registerednoise sources on the quantum transport and in particular model Markoviandecoherence via non-local coupling to nearby quantum point contacts which serveas information readouts. We find that the rate of decoherence experienced by aspatial superposition initially grows with spatial separation but surprisinglythen plateaus. In addition we include non-Markovian effects due to couplings tonearby two level systems and we find that although the population transportexhibits robustness in the presence of both types of noise sources, thetransport of a spatial superposition exhibits severe fragility.

Adiabatic information transport in the presence of decoherence