Quantum limitations on superluminal propagation

Details Quantum limitations on superluminal propagation Quantum limitations on superluminal propagation

1998-04-07

arxiv.org/abs/quant-ph/9804018v1

Phys.Rev.Lett. 81 (1998) 2190-2193

Physics

Quantum Physics

RevTeX 4 pages

Scientific paper

10.1103/PhysRevLett.81.2190

Unstable systems such as media with inverted atomic population have been shown to allow the propagation of analytic wavepackets with group velocity faster than that of light, without violating causality. We illuminate the important role played by unstable modes in this propagation, and show that the quantum fluctuations of these modes, and their unitary time evolution, impose severe restrictions on the observation of superluminal phenomena.

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