Scaling of the local quantum uncertainty at quantum phase transitions

被引：23

作者：

Coulamy, I. B. ^{[1
]}

Warnes, J. H. ^{[1
]}

Sarandy, M. S. ^{[1
]}

Saguia, A. ^{[1
]}

机构：

[1] Univ Fed Fluminense, Inst Fis, Ave Gen Milton Tavares de Souza S-N, BR-24210346 Niteroi, RJ, Brazil

来源：

PHYSICS LETTERS A | 2016年 / 380卷 / 20期

关键词：

Quantum phase transitions; Quantum correlations; Quantum information theory; ENTANGLEMENT;

D O I：

10.1016/j.physleta.2016.03.026

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the local quantum uncertainty (LQU) between a block of L qubits and one single qubit in a composite system of n qubits driven through a quantum phase transition (QPT). A first-order QPT is analytically considered through a Hamiltonian implementation of the quantum search. In the case of second-order QPTs, we consider the transverse-field Ising chain via a numerical analysis through density matrix renormalization group. For both cases, we compute the LQU for finite-sizes as a function of L and of the coupling parameter, analyzing its pronounced behavior at the QPT. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：1724 / 1728

页数：5

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