X Entanglement: The Nonfactorable Spatiotemporal Structure of Biphoton Correlation
X Entanglement: The Nonfactorable Spatiotemporal Structure of Biphoton Correlation
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DOI：
10.1103/physrevlett.102.223601
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发表时间：
2009-06-05
影响因子：
8.6
通讯作者：
Lugiato, L. A.
中科院分区：
文献类型：
--
作者：
Gatti, A.;Brambilla, E.;Lugiato, L. A.
我们研究了参数下转换(PDC)中双光子纠缠的时空结构，并证明了它的不可因式X形几何。这种结构提供了PDC的超宽带，并可以利用来实现飞秒范围内的双光子时间局域化。这种极端的局部化与我们解析源近场中光子位置的能力有关。这种不可因子性开启了通过作用于双光子的空间自由度来定制时间纠缠的可能性。
We investigate the spatiotemporal structure of the biphoton entanglement in parametric down-conversion (PDC) and we demonstrate its nonfactorable X-shaped geometry. Such a structure gives access to the ultrabroad bandwidth of PDC, and can be exploited to achieve a biphoton temporal localization in the femtosecond range. This extreme localization is connected to our ability to resolve the photon positions in the source near field. The nonfactorability opens the possibility of tailoring the temporal entanglement by acting on the spatial degrees of freedom of twin photons.