Quantum probes to experimentally assess correlations in a composite system

被引：31
作者：
Smirne, Andrea [1 ,2 ,3 ]
Cialdi, Simone [1 ,3 ]
Anelli, Giorgio [1 ]
Paris, Matteo G. A. [1 ,4 ]
Vacchini, Bassano [1 ,3 ]
机构：
[1] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy
[2] Univ Trieste, Dipartmento Fis, I-34127 Trieste, Italy
[3] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy
[4] CNISM, I-20133 Milan, Italy
来源：
PHYSICAL REVIEW A | 2013年 / 88卷 / 01期
关键词：
ENTANGLEMENT;
D O I：
10.1103/PhysRevA.88.012108
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We suggest and demonstrate a technique to obtain relevant information about a composite system by performing measurements on only a small and easily accessible part of it, which we call a quantum probe. We show in particular how quantitative information about the angular correlations of pairs of entangled photons generated by spontaneous parametric down-conversion may be accessed through the study of the trace distance between two polarization states evolved from different initial conditions. After estimating the optimal polarization states to be used as the quantum probe, we provide a detailed analysis of the connections between the increase of the trace distance above its initial value and the amount of angular correlation.
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页数：7
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