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- W1569546736 abstract "We show that optical tachyonic dispersion corresponding to superluminal (faster than-light) group velocities characterizes parametrically amplifying media. The turn-on of parametric amplification in finite media, followed by illumination by spectrally narrow probe wavepackets, can give rise to transient tachyonic wavepackets. In the stable (sub-threshold) operating regime of an optical phase conjugator it is possible to transmit probe pulses with a superluminally advanced peak, whereas conjugate reflection is always subluminal. In the unstable (above-threshold) regime, superluminal response occurs both in reflection and in transmission, at times preceding the onset of exponential growth due to the instability. Remarkably, the quantum information transmitted by probe or conjugate pulses, albeit causal, is confined to times corresponding to superluminal velocities. These phenomena are explicitly analyzed for four-wave mixing, stimulated Raman scattering and parametric downconversion." @default.
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- W1569546736 date "1998-05-14" @default.
- W1569546736 modified "2023-09-26" @default.
- W1569546736 title "Optical Tachyons in Parametric Amplifiers: How Fast Can Quantum Information Travel?" @default.
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- W1569546736 doi "https://doi.org/10.48550/arxiv.quant-ph/9805040" @default.
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