Direct estimation of decoherence rates
Quantum Physics
2012-11-14 v2
Abstract
The decoherence rate is a nonlinear channel parameter that describes quantitatively the decay of the off-diagonal elements of a density operator in the decoherence basis. We address the question of how to experimentally access such a nonlinear parameter directly without the need of complete process tomography. In particular, we design a simple experiment working with two copies of the channel, in which the registered mean value of a two-valued measurement directly determines the value of the average decoherence rate. No prior knowledge of the decoherence basis is required.
Cite
@article{arxiv.1207.3053,
title = {Direct estimation of decoherence rates},
author = {Vladimír Bužek and Peter Rapcan and Jochen Rau and Mario Ziman},
journal= {arXiv preprint arXiv:1207.3053},
year = {2012}
}
Comments
7 pages, 2 figures, v2: reference added