Adiabatic Transfer of Electrons in Coupled Quantum Dots
Abstract
We investigate the influence of dissipation on one- and two-qubit rotations in coupled semiconductor quantum dots, using a (pseudo) spin-boson model with adiabatically varying parameters. For weak dissipation, we solve a master equation, compare with direct perturbation theory, and derive an expression for the `fidelity loss' during a simple operation that adiabatically moves an electron between two coupled dots. We discuss the possibility of visualizing coherent quantum oscillations in electron `pump' currents, combining quantum adiabaticity and Coulomb blockade. In two-qubit spin-swap operations where the role of intermediate charge states has been discussed recently, we apply our formalism to calculate the fidelity loss due to charge tunneling between two dots.
Cite
@article{arxiv.cond-mat/0207257,
title = {Adiabatic Transfer of Electrons in Coupled Quantum Dots},
author = {T. Brandes and T. Vorrath},
journal= {arXiv preprint arXiv:cond-mat/0207257},
year = {2009}
}
Comments
13 pages, 8 figures, to appear in Phys. Rev. B