Dephasing of charge and spin in semiconductor quantum dots

Phonon induced unavoidable decoherence of orbital degrees of freedom (charge) in quantum dots is studied and the relevant time scales are estimated for state-of-the-art self-assembled nanostructures. An significant enhancement of the effective Fröhlich constant due to localization is indicated. Temporal partial inefficiency of spin Pauli blocking in quantum dots, caused by lattice inertia, is predicted. For quantum dots placed in a diluted magnetic semiconductor medium a magnon-induced dephasing of spin localized in quantum dot is also estimated. The assessed decoherence rates for both orbital and spin degrees of freedom in semiconductor nanostructures turn out to not satisfy DiVincenzo conditions required for quantum error correction scheme implementations