Joint temporal density measurements for two-photon state characterization.

  title={Joint temporal density measurements for two-photon state characterization.},
  author={Onur Kuzucu and Franco N. C. Wong and Sunao Kurimura and Sergey V. Tovstonog},
  journal={Physical review letters},
  volume={101 15},
We demonstrate a technique for characterizing two-photon quantum states based on joint temporal correlation measurements using time-resolved single-photon detection by femtosecond up-conversion. We measure for the first time the joint temporal density of a two-photon entangled state, showing clearly the time anticorrelation of the coincident-frequency entangled photon pair generated by ultrafast spontaneous parametric down-conversion under extended phase-matching conditions. The new technique… CONTINUE READING
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