Nonlinear entanglement witnesses

被引：97
|
作者：
Gühne, O
Lütkenhaus, N
机构：
[1] Austrian Acad Sci, Inst Quantenopt & Quanteninformat, A-6020 Innsbruck, Austria
[2] Univ Erlangen Nurnberg, Quantum Informat Theory Grp, Inst Theoret Phys 1, D-91058 Erlangen, Germany
[3] Univ Erlangen Nurnberg, Max Planck Res Grp, Inst Opt Informat & Photon, D-91058 Erlangen, Germany
[4] Univ Waterloo, Inst Quantum Comp, Waterloo, ON N2L 3G1, Canada
来源：
PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 17期
关键词：
D O I：
10.1103/PhysRevLett.96.170502
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Entanglement detection typically relies on linear inequalities for mean values of certain observables (entanglement witnesses), where violation indicates entanglement. We provide a general method to improve any of these inequalities for bipartite systems via nonlinear expressions. The nonlinearities are of different orders and can be directly measured in experiments, often without any extra effort.
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页数：4
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