We have studied theoretically the basic operation of a quantum feedback loop designed to maintain the desired phase of quantum coherent oscillations in a two-level system. Such feedback can suppress the dephasing of oscillations due to interaction with environment. Prospective experiments can be realized using metallic single-electron devices or GaAs technology.
@article{arxiv.cond-mat/0107280,
title = {Quantum feedback control of a solid-state two-level system},
author = {Rusko Ruskov and Alexander N. Korotkov},
journal= {arXiv preprint arXiv:cond-mat/0107280},
year = {2007}
}