Evolution equation for quantum entanglement

被引：148

作者：

Konrad, Thomas ^{[2
]}

De Melo, Fernando ^{[1
,3
]}

Tiersch, Markus ^{[1
,3
]}

Kasztelan, Christian ^{[4
]}

Aragao, Adriano ^{[1
,5
]}

Buchleitner, Andreas ^{[1
,3
]}

机构：

[1] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

[2] Univ KwaZulu Natal, Quantum Res Grp, Sch Phys, ZA-4000 Durban, South Africa

[3] Univ Freiburg, Inst Phys, D-79104 Freiburg, Germany

[4] Rhein Westfal TH Aachen, Inst Theoret Phys C, D-52056 Aachen, Germany

[5] Univ Fed Rio de Janeiro, Inst Fis, BR-21945970 Rio De Janeiro, Brazil

来源：

NATURE PHYSICS | 2008年 / 4卷 / 02期

关键词：

D O I：

10.1038/nphys885

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quantum information technology(1) largely relies on a precious and fragile resource, quantum entanglement, a highly nontrivial manifestation of the coherent superposition of states of composite quantum systems. However, our knowledge of the time evolution of this resource under realistic conditions-that is, when corrupted by environment-induced decoherence is so far limited, and general statements on entanglement dynamics in open systems are scarce(2-11). Here we prove a simple and general factorization law for quantum systems shared by two parties, which describes the time evolution of entanglement on passage of either component through an arbitrary noisy channel. The robustness of entanglement-based quantum information processing protocols is thus easily and fully characterized by a single quantity.

引用

页码：99 / 102

页数：4

共 22 条

[1] Environment-induced sudden death of entanglement [J].