[15p-PB02-1~5] 3.9 Optical quantum physics and technologies (formerly 3.10)

[15p-PB02-1] Evaluation of photon number distribution using autocorrelation function for Quantum Key Distribution

〇Ryoji Matsumoto¹, Akihisa Tomita², Atsushi Okamoto² (1.IST-Hokkaido Univ., 2.Fac. of IST-Hokkaido Univ.)

Keywords:Quantum Key Distribution, Photon number distribution, Autocorrelation function

In implementing QKD using WCP sources, PNS attack using multiphoton pulses affect the security of QKD. It is known that decoy method can be applied to beat the attack, but it requires knowledge of photon number distribution, and therefore it is necessary to establish an experimental verification method to guarantee the security of QKD. In this study, we measured the autocorrelation function of a pulsed laser as an evaluation of photon number distribution for QKD.