Abstract
Using an all-fiber source of pulsed twin beams, with the record intensity difference squeezing of 6.1±0.15 dB for fiber optical parametric amplifiers, we experimentally distribute the pulsed continuous variable (CV) quantum state over a long distance. After separating the signal and idler twin beams by 26km single-mode fibers, the measured intensity difference noise is still below the shot noise limit by 2dB. The result shows that the distribution process is only affected by the vacuum noise originated from the fiber transmission loss. The extra noise contributed by the acoustic wave Brillouin scattering and Raman scattering in 26km transmission fibers has not been observed. The investigation is beneficial for studying long-distance CV quantum communication.
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