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A novel post-selection scheme is proposed to generate squeezed vacuum pulses using noisy fiber laser pulses at 1550 nm. By selecting only coherent pulses with low excess noise, quadrature squeezing is obtainable with conditional homodyne detection.
Short length optical fibers are proved to be effective to reduce Brillouin scattering noise and produce squeezed vacuum even at low repetition pulse rates. Noise reduction of 2.4 dB below the shot noise level is observed.
Squeezed vacuum (SV) generation through third-order optical nonlinearity chi(3) is useful for generating a quantum entanglement pair based on continuous variable. However, third-order nonlinearity is usually small. Therefore, the typical interaction length should be large and ultrashort laser pulses should be used. Then, it becomes important to avoid excess phase noise, especially guided-acoustic-wave...
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