Experimental study of a subsystem in an entangled two-photon state

被引：24

作者：

Strekalov, DV ^{[1
]}

Kim, YH ^{[1
]}

Shih, Y ^{[1
]}

机构：

[1] Univ Maryland Baltimore Cty, Dept Phys, Baltimore, MD 21250 USA

来源：

PHYSICAL REVIEW A | 1999年 / 60卷 / 04期

关键词：

D O I：

10.1103/PhysRevA.60.2685

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The state of a signal-idler photon pair of spontaneous parametric down-conversion is a typical nonlocal entangled pure state with zero entropy. The precise correlation of the subsystems is completely described by the state. However, it is an experimental choice to study only one subsystem and to ignore the other. What can we learn about the measured subsystem? Results of this kind of measurements look peculiar. The experiment confirms that the two subsystems are both in mixed states with entropy greater than zero. One can only obtain statistical knowledge of the subsystems in this kind of measurement. [S1050-2947(99)02610-4].

引用

页码：2685 / 2688

页数：4

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