Tachyons and information transfer in quantized parametric amplifiers
Chemical Physics Department, Weizmann Institute of Science - Rehovot 76100 Israel
Accepted: 20 April 1998
We show that the injection of spectrally narrow probe wave packets into quantized parametrically amplifying media can give rise to transient tachyonic wave packets. Remarkably, their quantum information, albeit causal, is confined to times corresponding to superluminal velocities, which is advantageous for communications. These phenomena are explicitly analyzed for stimulated Raman scattering, parametric down-conversion and four-wave mixing.
PACS: 42.50.Md – Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasing and revivals, optical nutation, and self-induced transparency / 03.30.+p – Special relativity / 42.50.Lc – Quantum fluctuations, quantum noise, and quantum jumps
© EDP Sciences, 1998