Optimized Quantum Random Number Generator for Single Photon LiDAR Interference Suppression

Single photon light detection and ranging (LiDAR) sensors have been facing serious issues of light interference and optical attacks. Random modulation of transmitted laser can effectively suppress interference and counter attacks. Quantum Random Number Generator (QRNG) based on single photon detection of LiDAR has become an important solution for generating true random numbers. The performance of traditional QRNG based on the parity of counting values of photon events (CntOE-QRNG) is poor under low photon event rate. This letter proposes a novel QRNG method based on parity discrimination of photon event interval (IntOE-QRNG). It is proved that the IntOE-QRNG has more advantages under the condition of low photon event rate. Based on the analysis of the advantages and disadvantages of these two methods, this letter finally proposes an optimized QRNG that combines these two methods to adapt to different photon event rate conditions.