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Parametric Amplification and Signal-to-Noise Ratio in Optical Transmission Lines
No full textThe equivalence between squeezing of the loss and phase-dependent amplification of the signal in an optical transmission line is shown. The properties of the radiation at the end of a lossy line, where N phase sensitive linear amplifiers have been inserted, are analyzed and discussed. In the large N limit a logarithmic dependence of the noise on the loss, which reduces the degradation of the signal-to-noise ratio, is obtained. It is also shown that by considering a χ(2) waveguide the same result can be achieved
Generation of macroscopically distinguishable quantum states and detection by the squeezed vacuum technique
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