Photon bunching in parametric down-conversion with continuous-wave excitation

  • Blauensteiner B
  • Herbauts I
  • Bettelli S
 et al. 
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The first direct measurement of photon bunching (g2 correlation function) in one output arm of a spontaneous-parametric-down-conversion source operated with a continuous pump laser in the single-photon regime is demonstrated. The result is in agreement with the statistics of a thermal field of the same coherence length, and shows the feasibility of investigating photon statistics with compact cw-pumped sources. Implications for entanglement-based quantum cryptography are discussed.

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  • Bibiane Blauensteiner

  • Isabelle Herbauts

  • Stefano Bettelli

  • Andreas Poppe

  • Hannes Hübel

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