Generation of sub-Poissonian pulses of light

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Abstract
Sub-Poissonian pulses of light are generated by means of traveling-wave optical parametric deamplification. Upon direct detection the quantum noise on the deamplified pulses is measured to be below the shot-noise limit by as much as 0.5±0.2 dB (11±4 %). The parametric-gain dependence of the measured Fano factor—direct-detection noise as a fraction of the shot-noise limit—agrees with the quantum theory of the amplifier when diffraction effects are taken into account.