Quantum fidelity in the thermodynamic limit
Quantum Physics
2015-05-20 v2 Statistical Mechanics
Strongly Correlated Electrons
Abstract
We study quantum fidelity, the overlap between two ground states of a many-body system, focusing on the thermodynamic regime. We show how drop of fidelity near a critical point encodes universal information about a quantum phase transition. Our general scaling results are illustrated in the quantum Ising chain for which a remarkably simple expression for fidelity is found.
Cite
@article{arxiv.1010.1048,
title = {Quantum fidelity in the thermodynamic limit},
author = {Marek M. Rams and Bogdan Damski},
journal= {arXiv preprint arXiv:1010.1048},
year = {2015}
}
Comments
4 pages, 4 figures, rearranged a bit to improve presentation