We report on the measurement of photon coincidence and photon number statistics of the spontaneous parametric down-converted radiation excited by incoherent pump. A high ratio of photon coincidences in case of multimode acquisition suggests that the present technique may find application in quantum experiments. Experimental and numerical simulation results confirmed that the coincidence ratio in a photon counting experiment is tightly coupled to the coherence of the pump beam. An experiment on verification of statistical properties of the down-converted radiation allowed us to evaluate the afterpulse generation probability of the photon counters.

Keywords: spontaneous parametric down-conversion, biphoton field, photon correlation, photon statistics
PACS: 42.50.Ar, 42.65.Lm

PARAMETRINĖS FLUORESCENCIJOS, ŽADINAMOS MĖLYNU ŠVIESOS DIODU LiIO₃ KRISTALE, FOTONŲ KORELIACIJA IR STATISTIKA
J. Galinis^a, M. Karpiński^b, G. Tamošauskas^a , K. Dobek^c,d, A. Piskarskas^a
aVilniaus universiteto Kvantinės elektronikos katedra, Vilnius, Lietuva
^bVaršuvos universiteto Fizikos fakultetas, Varšuva, Lenkija
^cMikalojaus Koperniko universiteto Fizikos institutas, Torūnė, Lenkija
^dAdomo Mickevičiaus universiteto Fizikos fakultetas, Poznanė, Lenkija

Darbe pateikiami parametrinės fluorescencijos, žadinamos nekoherentiniu kaupinimu, fotonų koreliacijos ir statistikos matavimų rezultatai. Didelis sutampančių fotonų srautas daugiamodžio šviesolaidžio detekcijos atveju parodo, kad pateiktas bifotonio lauko generavimo metodas gali būti taikomas kvantiniuose eksperimentuose. Eksperimentiniai ir skaitmeninio modeliavimo rezultatai patvirtina, kad fotonų sutapimo tikimybė glaudžiai siejasi su kaupinimo pluošto koherentiškumu. Parametrinės fluorescencijos fotonų statistikos rezultatai leido įvertinti naudotų fotonų detektorių postimpulsų tikimybę.

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