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Signal velocity, causality, and quantum noise in superluminal light
pulse propagation
release_yzsoqt3l6rgjxlxdmoshimuulq
by
A. Kuzmich,
A. Dogariu,
L. J. Wang,
P. W. Milonni,
R. Y. Chiao
Released
as a article
.
2001
Abstract
We consider pulse propagation in a linear anomalously dispersive medium where
the group velocity exceeds the speed of light in vacuum (c) or even becomes
negative. A signal velocity is defined operationally based on the optical
signal-to-noise ratio, and is computed for cases appropriate to the recent
experiment where such a negative group velocity was observed. It is found that
quantum fluctuations limit the signal velocity to values less than c.
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