Signal velocity, causality, and quantum noise in superluminal light pulse propagation

Details Signal velocity, causality, and quantum noise in superluminal light pulse propagation Signal velocity, causality, and quantum noise in superluminal light pulse propagation

2001-01-16

arxiv.org/abs/physics/0101068v1

Physics

Optics

4 Journal pages, 3 figures

Scientific paper

10.1103/PhysRevLett.86.3925

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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