Testing sequential quantum measurements: how can maximal knowledge be extracted?
Abstract
The extraction of information from a quantum system unavoidably implies a modification of the measured system itself. It has been demonstrated recently that partial measurements can be carried out in order to extract only a portion of the information encoded in a quantum system, at the cost of inducing a limited amount of disturbance. Here we analyze experimentally the dynamics of sequential partial measurements carried out on a quantum system, focusing on the trade-off between the maximal information extractable and the disturbance. In particular we consider two different regimes of measurement, demonstrating that, by exploiting an adaptive strategy, an optimal trade-off between the two quantities can be found, as observed in a single measurement process. Such experimental result, achieved for two sequential measurements, can be extended to N measurement processes.
Cite
@article{arxiv.1110.6392,
title = {Testing sequential quantum measurements: how can maximal knowledge be extracted?},
author = {Eleonora Nagali and Simone Felicetti and Pierre-Louis de Assis and Vincenzo D'Ambrosio and Radim Filip and Fabio Sciarrino},
journal= {arXiv preprint arXiv:1110.6392},
year = {2013}
}
Comments
5 pages, 3 figures