Photon-count fluctuations of spontaneous parametric down conversion exhibit long-range correlations

Photon-count fluctuations of spontaneous parametric down conversion exhibit long-range correlations

We investigate the fluctuation dynamics of photons generated by spontaneous parametric down conversion (SPDC) using detrended fluctuation analysis (DFA). SPDC photon pairs were generated via a periodically poled potassium titanyl phosphate waveguide, pumped by a 405 nm continuous-wave laser. The sca...

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Veröffentlicht in:Journal of the Optical Society of America. B, Optical physics Optical physics, 2024-09, Vol.41 (9), p.2070
Hauptverfasser: Tey, Lian Seng, Muniandy, S. V., Chong, Wu Yi
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Muniandy, S. V.
Chong, Wu Yi
description We investigate the fluctuation dynamics of photons generated by spontaneous parametric down conversion (SPDC) using detrended fluctuation analysis (DFA). SPDC photon pairs were generated via a periodically poled potassium titanyl phosphate waveguide, pumped by a 405 nm continuous-wave laser. The scaling exponents obtained from DFA reveal that SPDC photons exhibit long-range correlations at high pump power regimes. The average scaling exponent of DFA increases from 0.67 to 0.97 as the laser diode drive current increases, indicating the existence of long-range correlations. Our analysis concluded that the scaling exponent of aggregated time series is correlated to the number of SPDC photon pairs.
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title Photon-count fluctuations of spontaneous parametric down conversion exhibit long-range correlations
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