Compact Quantum Random Number Generator Based on a Laser Diode and a Hybrid Chip with Integrated Silicon Photonics

Author:

Wang Xuyang123ORCID,Zheng Tao1,Jia Yanxiang1,Huang Jin1,Zhu Xinyi1,Shi Yuqi1,Wang Ning12,Lu Zhenguo12,Zou Jun4ORCID,Li Yongmin123ORCID

Affiliation:

1. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China

2. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

3. Hefei National Laboratory, Hefei 230088, China

4. ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou 311215, China

Abstract

In this study, a compact and low-power-consumption quantum random number generator (QRNG) based on a laser diode and a hybrid chip with integrated silicon photonics is proposed and verified experimentally. The hybrid chip’s size is 8.8 × 2.6 × 1 mm3, and the power of the entropy source is 80 mW. A common-mode rejection ratio greater than 40 dB was achieved using an optimized 1 × 2 multimode interferometer structure. A method for optimizing the quantum-to-classical noise ratio is presented. A quantum-to-classical noise ratio of approximately 9 dB was achieved when the photoelectron current is 1 μA using a balance homodyne detector with a high dark current GeSi photodiode. The proposed QRNG has the potential for use in scenarios of moderate MHz random number generation speed, with low power, small volume, and low cost prioritized.

Funder

Provincial Natural Science Foundation of Shanxi, China

Shanxi Provincial Foundation for Returned Scholars, China

Aeronautical Science Foundation of China

National Natural Science Foundation of China

Program of State Key Laboratory of Quantum Optics and Quantum Optics Devices

“1331 Project” for Key Subject Construction of Shanxi Province, China, and the Innovation Program for Quantum Science and Technology

Publisher

MDPI AG

Reference42 articles.

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