Stabilizing qubit coherence via tracking-control
Quantum Physics
2007-05-23 v1
Abstract
We consider the problem of stabilizing the coherence of a single qubit subject to Markovian decoherence, via the application of a control Hamiltonian, without any additional resources. In this case neither quantum error correction/avoidance, nor dynamical decoupling applies. We show that using tracking-control, i.e., the conditioning of the control field on the state of the qubit, it is possible to maintain coherence for finite time durations, until the control field diverges.
Cite
@article{arxiv.quant-ph/0410048,
title = {Stabilizing qubit coherence via tracking-control},
author = {Daniel A. Lidar and Sara Schneider},
journal= {arXiv preprint arXiv:quant-ph/0410048},
year = {2007}
}
Comments
11 pages (single column), incl. 3 figures. Submitted to special issue of Quantum Information & Computation, following the Conference on Quantum Information and Quantum Control, Toronto, July '04