Superluminal speed1/8/2023 ![]() Four-wave mixing produces cleaner, less noisy pulses with a greater increase in speed by "re-phasing" or rearranging the light waves that make up the pulse. The method introduces a great deal of noise with no great increase in the apparent speed. Recent experiments have generated "uninformed" faster-than-light pulses by amplifying the leading edge of the pulse and attenuating, or cutting off, the back end. The leading edge of that curve can't exceed the speed of light, but the main hump, the peak of the pulse, can be skewed forward or backward, arriving sooner or later than it normally would. A short burst of light arrives as a sort of (usually) symmetric curve like a bell curve in statistics. No information can travel faster than light.īut there's kind of a loophole. The new method could be used to improve the timing of communications signals and to investigate the propagation of quantum correlations.Īccording to Einstein's special theory of relativity, light traveling in a vacuum is the universal speed limit. ![]() ![]() Researchers at the National Institute of Standards and Technology (NIST) have developed a novel way of producing light pulses that are "superluminal"-in some sense they travel faster than the speed of light.* The technique, called four-wave mixing, reshapes parts of light pulses and advances them ahead of where they would have been had they been left to travel unaltered through a vacuum.
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