Time-resolved homodyne characterization of individual quadrature-entangled pulses
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- Wenger, J., Ourjoumtsev, A., Tualle-Brouri, R. et al. Eur. Phys. J. D (2005) 32: 391. doi:10.1140/epjd/e2004-00190-3
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We describe a simple and efficient set-up to generate and characterize femtosecond quadrature-entangled pulses. Quantum correlations equivalent to about 2.5 dB squeezing are efficiently and easily reached using the non-degenerate parametric amplification of femtosecond pulses through a single-pass in a thin (100 μm) potassium niobate crystal. The entangled pulses are then individually sampled to characterize the non-separability and the entropy of formation of the states. The complete experiment is analysed in the time-domain, from the pulsed source of quadrature entanglement to the time-resolved homodyne detection. This particularity allows for applications in quantum communication protocols using continuous-variable entanglement.