SPECIAL ISSUE: The Korepin Festschrift From Statistical Mechanics to Quantum Information Science A Collection of Articles Written in Honor of the 60th Birthday of Vladimir KorepinNo Access
QUANTUM DISCORD IN A SPIN SYSTEM WITH SYMMETRY BREAKING
https://doi.org/10.1142/S0217979212430023Cited by:17 (Source: Crossref)
Abstract
We analyze the quantum discordQ throughout the low temperature phase diagram of the quantum XY model in transverse field. We first focus on the T = 0 order–disorder quantum phase transition QPT both in the symmetric ground state and in the symmetry broken one. Beside it, we highlight how Q displays clear anomalies also at a noncritical value of the control parameter inside the ordered phase, where the ground state is completely factorized. We evidence how the phenomenon is in fact of collective nature and displays universal features. We also study Q at finite temperature. We show that, close to the QPT, Q exhibits quantum-classical crossover of the system with universal scaling behavior. We evidence a nontrivial pattern of thermal correlations resulting from the factorization phenomenon.
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