Fast Causal Information Transmission in a Medium With a Slow Group Velocity

Details Fast Causal Information Transmission in a Medium With a Slow Group Velocity Fast Causal Information Transmission in a Medium With a Slow Group Velocity

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvl..94e3902s&link_type=abstract

Physical Review Letters, vol. 94, Issue 5, id. 053902

Computer Science

Information Theory

23

Wave Propagation, Transmission And Absorption, Effects Of Atomic Coherence On Propagation, Absorption, And Amplification Of Light, Electromagnetically Induced Transparency And Absorption, Information Theory And Communication Theory

Scientific paper

It is widely believed that the velocity of information υi encoded on an optical pulse is equal to the group velocity υg, at least when υg is less than the speed of light in vacuum c. On the other hand, several authors suggest that υi=c, although the size of the signal traveling at this velocity may be small, thereby making it difficult to measure. Here, we measure υi for pulses propagating through a resonant “slow-light” medium where υg≈0.006c. We find υi=1.03c+0.49c-0.25c, or that υi≈168υg, clearly demonstrating that the speed of information cannot be generally described by υg, but is characterized by its own velocity.

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