Interpreting Quantum Discord in Quantum Metrology
Quantum Physics
2015-11-04 v2
Abstract
Multipartite quantum systems show properties which do not admit a classical explanation. In particular, even nonentangled states can enjoy a kind of quantum correlations called quantum discord. I discuss some recent results on the role of quantum discord in metrology. Given an interferometric phase estimation protocol where the Hamiltonian is initially unknown to the experimentalist, the quantum discord of the probe state quantifies the minimum precision of the estimation. This provides a physical interpretation to a widely investigated information-theoretic quantity.
Cite
@article{arxiv.1502.04549,
title = {Interpreting Quantum Discord in Quantum Metrology},
author = {Davide Girolami},
journal= {arXiv preprint arXiv:1502.04549},
year = {2015}
}
Comments
Contribution to the conference "DICE 2014: Spacetime - Matter - Quantum Mechanics"