Quantum information in semiconductor-based nanostructures

A potential implementation of quantum-computation/information schemes in se miconductor-based structures is investigated. In particular, an array of qu antum dots is shown to be an ideal quantum register for a noiseless informa tion encoding. In addition to the suppression of phase-breaking processes i n quantum dots due to the well-known phonon bottleneck, we show that a prop er quantum encoding allows to realise a decoherence-free evolution on a tim e-scale long compared to the femtosecond scale of modern ultrafast laser te chnology. (C) 1999 Elsevier Science B.V. All rights reserved.