Massive and parallel 10 Tbit/s physical random bit generation with chaotic microcomb

Yuqi Hu; Qingsong Bai; Xi Tang; Wei Xiong; Yilu Wu; Xin Zhang; Yanlan Xiao; Runchang Du; Leiji Liu; Guangqiong Xia; Zhengmao Wu; Junbo Yang; Heng Zhou; Jiagui Wu

doi:10.1007/s12200-023-00081-4

Massive and parallel 10 Tbit/s physical random bit generation with chaotic microcomb

Front Optoelectron. 2023 Sep 22;16(1):24. doi: 10.1007/s12200-023-00081-4.

Authors

Yuqi Hu^#^{1

2}, Qingsong Bai^#², Xi Tang^#³, Wei Xiong^#³, Yilu Wu¹, Xin Zhang³, Yanlan Xiao⁴, Runchang Du², Leiji Liu², Guangqiong Xia³, Zhengmao Wu³, Junbo Yang⁵, Heng Zhou⁶, Jiagui Wu⁷

Affiliations

¹ College of Artificial Intelligence, Southwest University, Chongqing, 400715, China.
² Chengdu Spaceon Electronics Corporation Ltd., Chengdu, 610037, China.
³ School of Physical Science and Technology, Southwest University, Chongqing, 400715, China.
⁴ Key Lab of Optical Fiber Sensing and Communication Networks, University of Electronic Science and Technology of China, Chengdu, 611731, China.
⁵ Center of Material Science, National University of Defense Technology, Changsha, 410073, China. yangjunbo@nudt.edu.cn.
⁶ Key Lab of Optical Fiber Sensing and Communication Networks, University of Electronic Science and Technology of China, Chengdu, 611731, China. zhouheng@uestc.edu.cn.
⁷ School of Physical Science and Technology, Southwest University, Chongqing, 400715, China. mgh@swu.edu.cn.

^# Contributed equally.

Abstract

Ultrafast physical random bit (PRB) generators and integrated schemes have proven to be valuable in a broad range of scientific and technological applications. In this study, we experimentally demonstrated a PRB scheme with a chaotic microcomb using a chip-scale integrated resonator. A microcomb contained hundreds of chaotic channels, and each comb tooth functioned as an entropy source for the PRB. First, a 12 Gbits/s PRB signal was obtained for each tooth channel with proper post-processing and passed the NIST Special Publication 800-22 statistical tests. The chaotic microcomb covered a wavelength range from 1430 to 1675 nm with a free spectral range (FSR) of 100 GHz. Consequently, the combined random bit sequence could achieve an ultra-high rate of about 4 Tbits/s (12 Gbits/s × 294 = 3.528 Tbits/s), with 294 teeth in the experimental microcomb. Additionally, denser microcombs were experimentally realized using an integrated resonator with 33.6 GHz FSR. A total of 805 chaotic comb teeth were observed and covered the wavelength range from 1430 to 1670 nm. In each tooth channel, 12 Gbits/s random sequences was generated, which passed the NIST test. Consequently, the total rate of the PRB was approximately 10 Tbits/s (12 Gbits/s × 805 = 9.66 Tbits/s). These results could offer potential chip solutions of Pbits/s PRB with the features of low cost and a high degree of parallelism.

Keywords: Chaos; Microcomb; Physical random bit.