Exploring Hilbert space: Accurate characterization of quantum information

被引：105

作者：

White, AG ^{[1
]}

James, DFV

Munro, WJ

Kwiat, PG

机构：

[1] Univ Queensland, Dept Phys, Brisbane, Qld 4072, Australia

[2] Los Alamos Natl Lab, Div Theory, Los Alamos, NM 87545 USA

[3] Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87545 USA

[4] Hewlett Packard Labs, Maths Cryptog & Secur Grp, Bristol BS34 8QZ, Avon, England

[5] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

来源：

PHYSICAL REVIEW A | 2002年 / 65卷 / 01期

关键词：

D O I：

10.1103/PhysRevA.65.012301

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report the creation of a wide range of quantum states with controllable degrees of entanglement and entropy using an optical two-qubit source based on spontaneous parametric down-conversion. The states are characterized using measures of entanglement and entropy determined from tomographically determined density matrices. The tangle-entropy plane is introduced as a graphical representation of these states, and the theoretic upper bound for the maximum amount of entanglement possible for a given entropy is presented. Such a combination of general quantum state creation and accurate characterization is an essential prerequisite for quantum device development.

引用

页码：123011 / 123014

页数：4

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