paper

Quantum fidelity in the thermodynamic limit

arXiv:1010.1048 · doi:10.1103/PhysRevLett.106.055701

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.

4 pages, 4 figures, rearranged a bit to improve presentation

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