Photon bunching in parametric down-conversion with continuous wave excitation
Bibiane Blauensteiner, Isabelle Herbauts, Stefano Bettelli, Andreas, Poppe, Hannes H\"ubel
TL;DR
This paper reports the first direct measurement of photon bunching in a CW-pumped spontaneous parametric down-conversion source, demonstrating thermal-like photon statistics and potential for quantum cryptography applications.
Contribution
It provides the first direct measurement of photon bunching in a CW-pumped SPDC source, confirming thermal statistics and enabling compact quantum optics sources.
Findings
Photon bunching observed in CW SPDC source
Photon statistics match thermal field predictions
Feasibility of compact CW sources for quantum cryptography
Abstract
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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