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Signal Velocity, Causality, and Quantum Noise in Superluminal Light Pulse Propagation
2001
Physical Review Letters
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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.
doi:10.1103/physrevlett.86.3925
pmid:11328062
fatcat:tlvupqt4azhn7hcgjkoegtqxpa