Time-resolved homodyne characterization of individual quadrature-entangled pulses

Details Time-resolved homodyne characterization of individual quadrature-entangled pulses Time-resolved homodyne characterization of individual quadrature-entangled pulses

2004-09-29

arxiv.org/abs/quant-ph/0409211v1

Eur. Phys. J. D 32, 391-396 (2005)

Physics

Quantum Physics

7 pages, 5 figures

Scientific paper

10.1140/epjd/e2004-00190-3

We describe a simple and efficient setup 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 (0.1 mm) 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.

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