Optimal estimation of two-qubit pure-state entanglement

被引：0
|
作者：
Acián, Antonio [1 ]
Tarrach, Rolf [1 ]
Vidal, Guifreá [1 ]
机构：
[1] Dept. d'Estructura Constituents M., Universitat de Barcelona, Diagonal 647, E-08028 Barcelona, Spain
来源：
Physical Review A - Atomic, Molecular, and Optical Physics | 2000年 / 61卷 / 06期
关键词：
Electron transport properties - Matrix algebra - Parameter estimation - Polarization - Vectors;
D O I：
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中图分类号：
学科分类号：
摘要：
The problem of optimally estimating the entanglement of an unknown pure state of two qubits was analyzed. For this purpose, the quality of the most general quantum measurements on N identical copies of the state was assessed through the gain of information they provide about the nonlocal parameter of the state. A solution to this problem was established and proven. In particular, it was shown that the optimal estimation of a nonlocal parameter can be done through a local measurement.
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页码：062307 / 062301
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