Realization of entanglement-assisted qubit-covariant symmetric-informationally-complete positive-operator-valued measurements

被引：18
|
作者：
Du, Jiangfeng [1 ]
Sun, Min
Peng, Xinhua
Durt, Thomas
机构：
[1] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China
[2] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China
[3] Univ Dortmund, Fachbereich Phys, D-44221 Dortmund, Germany
[4] Free Univ Brussels, TONA TENA, B-1050 Brussels, Belgium
来源：
PHYSICAL REVIEW A | 2006年 / 74卷 / 04期
关键词：
22;
D O I：
10.1103/PhysRevA.74.042341
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We realize NMR optimal tomography of a single qubit by coupling it to an ancilla, letting them interact, and measuring properties of the joint system. Among other advantages, this approach reduces the number of counting rates that are necessary for establishing tomography of the qubit, due to the fact that this number (equal to 4) is equal to the number of real parameters of the density matrix. Connections with the discrete Wigner distribution are emphasized and discussed.
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页数：4
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