Superluminal group velocity and effective velocity of information transfer

被引：0

作者：

Guo, Qizhi ^{[1
]}

Tan, Weihan ^{[1
]}

机构：

[1] Department of Physics, Shanghai University, Shanghai 200444, China

来源：

Guangxue Xuebao/Acta Optica Sinica | 2007年 / 27卷 / 02期

关键词：

Diffraction - Distortion (waves) - Information theory - Light propagation - Light velocity - Photons - Signal processing - Vacuum;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The influence of pulse distortion on superluminal group velocity in an anomalous dispersive medium is researched. The result shows that superluminal group velocity does not disappear even if there is no distortion for light pulse. But the group velocity of a pulse is not equal to the signal velocity. An effective velocity of information transfer is defined based on the information theory, and is applied to explain the experiment that a negative group velocity was observed by Wang, Kuzmich and Dogariu (WKD). Calculation of the information content of input and output pulse shows that the information content of output pulse will decrease due to diffraction of light wave and noise of photon. The effective velocity of light propagation is not greater than the light velocity in vacuum.

引用

页码：344 / 349