Barycentric measure of quantum entanglement

被引：48

作者：

Ganczarek, Wojciech ^{[1
]}

Kus, Marek ^{[2
]}

Zyczkowski, Karol ^{[1
,2
]}

机构：

[1] Jagiellonian Univ, Inst Phys, PL-30059 Krakow, Poland

[2] Polish Acad Sci, Ctr Theoret Phys, PL-02668 Warsaw, Poland

来源：

PHYSICAL REVIEW A | 2012年 / 85卷 / 03期

关键词：

GEOMETRY; STATES;

D O I：

10.1103/PhysRevA.85.032314

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Majorana representation of quantum states by a constellation of n "stars" (points on the sphere) can be used to describe any pure state of a simple system of dimension n + 1 or a permutation symmetric pure state of a composite system consisting of n qubits. We analyze the variance of the distribution of the stars, which can serve as a measure of the degree of noncoherence for simple systems or an entanglement measure for composed systems. Dynamics of the Majorana points induced by a unitary dynamics of a pure state is investigated.

引用

页数：10

共 28 条

[1]

AGARWAL GS, 1981, PHYS REV A, V24, P2889, DOI 10.1103/PhysRevA.24.2889

[2]

[Anonymous], 1989, The Emperor's New Mind: Concerning Computers, Minds, and the Laws of Physics

[3] The maximally entangled symmetric state in terms of the geometric measure [J].