超光速信号速度
Superluminal Signal Velocity
摘要：
最近已经证明，由倏逝模传递的信号可以比光传播得更快。本文介绍和研究了信号的一些特殊性质，如信号的频带有限性。消逝模式的特征在于特殊的性质：它们的能量是{ \it负}，它们不能直接测量，并且消逝区域不是因果关系，因为模式瞬间穿过该区域。研究表明，用量子力学原理解释经典倏逝模的超光速信号速度是必要的。
英文摘要：
It recently has been demonstrated that signals conveyed by evanescent modes can travel faster than light. In this report some special features of signals are introduced and investigated, for instance the fundamental property that signals are frequency band limited. Evanescent modes are characterized by extraordinary properties: Their energy is {\it negative}, they are not directly measurable, and the evanescent region is not causal since the modes traverse this region instantaneously. The study demonstrates the necessity of quantum mechanical principles in order to interprete the superluminal signal velocity of classical evanescent modes.
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