Permutationally Invariant Quantum Tomography

被引：173

作者：

Toth, G. ^{[1
,2
,3
]}

Wieczorek, W. ^{[4
,5
]}

Gross, D. ^{[6
]}

Krischek, R. ^{[4
,5
]}

Schwemmer, C. ^{[4
,5
]}

Weinfurter, H. ^{[4
,5
]}

机构：

[1] Univ Basque Country, Dept Theoret Phys, E-48080 Bilbao, Spain

[2] Basque Fdn Sci, IKERBASQUE, E-48011 Bilbao, Spain

[3] Hungarian Acad Sci, Res Inst Solid State Phys & Opt, H-1525 Budapest, Hungary

[4] Max Planck Inst Quantum Opt, D-85748 Garching, Germany

[5] Univ Munich, Fak Phys, D-80797 Munich, Germany

[6] Leibniz Univ Hannover, Inst Theoret Phys, D-30167 Hannover, Germany

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 25期

关键词：

MULTIPARTICLE ENTANGLEMENT;

D O I：

10.1103/PhysRevLett.105.250403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a scalable method for the tomography of large multiqubit quantum registers. It acquires information about the permutationally invariant part of the density operator, which is a good approximation to the true state in many relevant cases. Our method gives the best measurement strategy to minimize the experimental effort as well as the uncertainties of the reconstructed density matrix. We apply our method to the experimental tomography of a photonic four-qubit symmetric Dicke state.

引用

页数：4

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