The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics

, Volume 32, Issue 3, pp 391–396

Time-resolved homodyne characterization of individual quadrature-entangled pulses

  • J. Wenger
  • A. Ourjoumtsev
  • R. Tualle-Brouri
  • P. Grangier
Quantum Optics and Quantum Information

DOI: 10.1140/epjd/e2004-00190-3

Cite this article as:
Wenger, J., Ourjoumtsev, A., Tualle-Brouri, R. et al. Eur. Phys. J. D (2005) 32: 391. doi:10.1140/epjd/e2004-00190-3

Abstract.

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.

Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2004

Authors and Affiliations

  • J. Wenger
    • 1
  • A. Ourjoumtsev
    • 1
  • R. Tualle-Brouri
    • 1
  • P. Grangier
    • 1
  1. 1.Laboratoire Charles Fabry de l’Institut d’Optique, CNRS UMR 8501OrsayFrance