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In this letter we experimentally demonstrate that the signal velocity,defined as the earliest time when a signal is detected above the realisticnoise floor, may be altered by a region of anomalous dispersion. We encodeinformation in the spatial degree of freedom of an optical pulse so that theimprinted information is not limited by the frequency bandwidth of the regionof anomalous dispersion. We then show that the combination of superluminalpulse propagation and realistic detectors with non-ideal quantum efficiencyleads to a speed-up of the earliest experimentally obtainable arrival time ofthe transmitted signal even with the overall pulse experiencing unity gain.This speed-up is reliant upon non-ideal detectors and losses, as perfectdetection efficiency would result in the speed of information being equal tothe speed of light in vacuum, regardless of the group velocity of the opticalpulses.

Advanced Detection of Information in Optical Pulses with Negative Group Velocity