Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-06-13
Phys. Rev. B 76, 205305 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Final version, 14 pages, 11 figures
Scientific paper
10.1103/PhysRevB.76.205305
We study the influence of the environment on an optically induced rotation of a single electron spin in a charged semiconductor quantum dot. We analyze the decoherence mechanisms resulting from the dynamical lattice response to the charge evolution induced in a trion-based optical spin control scheme. Moreover, we study the effect of the finite trion lifetime and of the imperfections of the unitary evolution such as off-resonant excitations and the nonadiabaticity of the driving. We calculate the total error of the operation on a spin-based qubit in an InAs/GaAs quantum dot system and discuss possible optimization against the different contributions. We indicate the parameters which allow for coherent control of the spin with a single qubit gate error as low as $10^{-4}$.
Grodecka Anna
Knorr Andreas
Machnikowski Pawel
Weber Carsten
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