Experimental Comparison of Efficient Tomography Schemes for a Six-Qubit State

被引：60

作者：

Schwemmer, Christian ^{[1
,2
]}

Toth, Geza ^{[3
,4
,5
]}

Niggebaum, Alexander ^{[6
]}

Moroder, Tobias ^{[7
]}

Gross, David ^{[8
,9
]}

Guehne, Otfried ^{[7
]}

Weinfurter, Harald ^{[1
,2
]}

机构：

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

[2] Univ Munich, Dept Phys, D-80797 Munich, Germany

[3] Univ Basque Country, UPV EHU, Dept Theoret Phys, E-48080 Bilbao, Spain

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

[5] Hungarian Acad Sci, Wigner Res Ctr Phys, H-1525 Budapest, Hungary

[6] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

[7] Univ Siegen, Nat Wissensch Lich Tech Fak, D-57068 Siegen, Germany

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

[9] Univ Freiburg, FDM, D-79104 Freiburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 04期

关键词：

ENTANGLEMENT;

D O I：

10.1103/PhysRevLett.113.040503

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quantum state tomography suffers from the measurement effort increasing exponentially with the number of qubits. Here, we demonstrate permutationally invariant tomography for which, contrary to conventional tomography, all resources scale polynomially with the number of qubits both in terms of the measurement effort as well as the computational power needed to process and store the recorded data. We demonstrate the benefits of combining permutationally invariant tomography with compressed sensing by studying the influence of the pump power on the noise present in a six-qubit symmetric Dicke state, a case where full tomography is possible only for very high pump powers.

引用

页数：5

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