GAUSSIAN GEOMETRIC DISCORD

被引：58

作者：

Adesso, Gerardo ^{[1
]}

Girolami, Davide ^{[1
]}

机构：

[1] Univ Nottingham, Sch Math Sci, Nottingham NG7 2RD, England

来源：

INTERNATIONAL JOURNAL OF QUANTUM INFORMATION | 2011年 / 9卷 / 7-8期

关键词：

Geometric quantum discord; non-classical correlations; Gaussian states; CONTINUOUS-VARIABLE SYSTEMS; QUANTUM STATES; ENTANGLEMENT; TELEPORTATION;

D O I：

10.1142/S0219749911008192

中图分类号：

TP301 [理论、方法];

学科分类号：

081202 ;

摘要：

We extend the geometric measure of quantum discord, introduced and computed for two-qubit states, to quantify non-classical correlations in composite Gaussian states of continuous variable systems. We lay the formalism for the evaluation of a Gaussian geometric discord in two-mode Gaussian states, and present explicit formulas for the class of two-mode squeezed thermal states. In such a case, under physical constraints of bounded mean energy, geometric discord is shown to admit upper and lower bounds for a fixed value of the conventional (entropic) quantum discord. We finally discuss alternative geometric approaches to quantify Gaussian quadrature correlations.

引用

页码：1773 / 1786

页数：14

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