Ever since Einstein s special relativity in 1905, the principle
of invariant light speed in vacuum has been attracting attention
from a wide range of disciplines. How to interpret the principle of
light speed? Is light referred to continuous light, or light pulse
with definite boundaries? Recent discovery of superluminal medium
triggered vigorous discussion within the Physics community. Can
communication via such superluminal channel break the speed limit
and thus violate causality principle? Or, will a single photon,
which is not governed by classical laws of Physics, tend to break
the speed limit? To solve these problems, this Brief brings in
Optical Precursors, the theoretical works for which started as
early as 1914. This is a typical optical phenomenon combining wave
propagation theory and light-wave interaction. Both theory and
experimental works are covered in this Brief. The study of
precursor verifies that the effective information carried by light
pulses can never exceed the speed of light in vacuum- c. Further,
through observation from nonclassical single photon source, the
precursor rules out the probability of a single photon traveling
with the speed, breaking the classical limit.
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