Highly integrated broadband entropy source for quantum random number generators based on vacuum fluctuations
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866915971243966464 |
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| author | Wang, Xuyang Shi, Yuqi Wang, Ning Yun, Jie Li, Jiaxu Jia, Yanxiang Liu, Shuaishuai Lu, Zhenguo Zou, Jun Li, Yongmin |
| author_facet | Wang, Xuyang Shi, Yuqi Wang, Ning Yun, Jie Li, Jiaxu Jia, Yanxiang Liu, Shuaishuai Lu, Zhenguo Zou, Jun Li, Yongmin |
| contents | In this work, we designed and experimentally verified a highly integrated broadband entropy source for a quantum random number generator (QRNG) based on vacuum fluctuations. The core of the entropy source is a hybrid laser-and-silicon-photonics chip, which is only 6.3 $ \times $ 2.6 $ \times $ 1.5 mm$^{3}$ in size. A balanced homodyne detector based on cascaded radio-frequency amplifiers in the entropy source achieves a 3 dB bandwidth of 2.4 GHz and a common-mode rejection ratio above 25 dB. The quantum-to-classical-noise ratio is 9.51 dB at a photoelectron current of 1 mA. The noise equivalent power and equivalent transimpedance are 8.85$\,\text{pW}/\sqrt{\text{Hz}}$ , and 22.8 k$Ω$, respectively. After optimization using equalizer technology that eliminates the dependence of adjacent samples, the quantum random number generation rate reaches 67.9 Gbps under average conditional minimum entropy and 61.9 Gbps under the worst-case conditional minimum entropy. The developed hybrid chip enhances the integrability and speed of QRNG entropy sources based on vacuum fluctuations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_18795 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Highly integrated broadband entropy source for quantum random number generators based on vacuum fluctuations Wang, Xuyang Shi, Yuqi Wang, Ning Yun, Jie Li, Jiaxu Jia, Yanxiang Liu, Shuaishuai Lu, Zhenguo Zou, Jun Li, Yongmin Quantum Physics In this work, we designed and experimentally verified a highly integrated broadband entropy source for a quantum random number generator (QRNG) based on vacuum fluctuations. The core of the entropy source is a hybrid laser-and-silicon-photonics chip, which is only 6.3 $ \times $ 2.6 $ \times $ 1.5 mm$^{3}$ in size. A balanced homodyne detector based on cascaded radio-frequency amplifiers in the entropy source achieves a 3 dB bandwidth of 2.4 GHz and a common-mode rejection ratio above 25 dB. The quantum-to-classical-noise ratio is 9.51 dB at a photoelectron current of 1 mA. The noise equivalent power and equivalent transimpedance are 8.85$\,\text{pW}/\sqrt{\text{Hz}}$ , and 22.8 k$Ω$, respectively. After optimization using equalizer technology that eliminates the dependence of adjacent samples, the quantum random number generation rate reaches 67.9 Gbps under average conditional minimum entropy and 61.9 Gbps under the worst-case conditional minimum entropy. The developed hybrid chip enhances the integrability and speed of QRNG entropy sources based on vacuum fluctuations. |
| title | Highly integrated broadband entropy source for quantum random number generators based on vacuum fluctuations |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2504.18795 |