Comparative Study of ASE-ASE and ASE-Laser Based Quantum Random Number Generators
Quantum random number generators (QRNG) based on amplified spontaneous emission (ASE) are known to achieve multi-gigabit-per-second rates through high-speed sampling of intensity and phase fluctuations. Two popular implementations of these QRNGs are based on balanced detection of ASE-ASE and ASE-Las...
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2024-01-01
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| author | Shreyam Maity Asish Prosad Harinee Natarajan V. Balaswamy Varun Raghunathan |
| author_facet | Shreyam Maity Asish Prosad Harinee Natarajan V. Balaswamy Varun Raghunathan |
| author_sort | Shreyam Maity |
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| description | Quantum random number generators (QRNG) based on amplified spontaneous emission (ASE) are known to achieve multi-gigabit-per-second rates through high-speed sampling of intensity and phase fluctuations. Two popular implementations of these QRNGs are based on balanced detection of ASE-ASE and ASE-Laser beating. The high QRNG rates reported so far however come at the price of increased system complexity, making it a clear deterrent for widespread use. In this paper, we perform a direct one-to-one comparison study between ASE-ASE and ASE-Laser-based QRNGs using detailed theoretical modeling and supporting experiments, with the goal of achieving 1 Gbps QRNG using simple, low-bandwidth photodetectors and low sampling rate digitizers. We develop, for the first time to the best of out knowledge, closed-form analytical expressions to describe the signal variance as a function of realistic, non-ideal fiber-optic optical components, the signal correlations as a function of digitizer sampling rate, and minimum entropy as a function of signal variance. We observe a trade-off between the correlations in the detected signals and the sampling rate used, thereby obtaining an optimum sampling rate and hence the digitizer specification for extracting the best randomness. We also observe the standard deviation in the signal distribution is higher for ASE-Laser QRNG in comparison to the ASE-ASE implementation. Using off-the-shelf telecom fiber components, balanced detectors with bandwidth as low as 100 MHz, and an 8-bit digitizer operating at a sampling rate of 100 Megasamples-per-second (MSPS), we achieve QRNG rates of 546.03 Mbps and 507.94 Mbps for the ASE-ASE and ASE-Laser beating implementations respectively. The ASE-ASE QRNG rates are subsequently doubled to more than 1 Gbps using polarization multiplexing and bit-interleaving. |
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| language | English |
| publishDate | 2024-01-01 |
| publisher | IEEE |
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| series | IEEE Photonics Journal |
| spelling | doaj-art-2f99ad8c15e84376a56c5a8f1341bd1d2025-07-01T23:57:46ZengIEEEIEEE Photonics Journal1943-06552024-01-0116211010.1109/JPHOT.2024.337364410460108Comparative Study of ASE-ASE and ASE-Laser Based Quantum Random Number GeneratorsShreyam Maity0https://orcid.org/0009-0002-2423-6504Asish Prosad1https://orcid.org/0009-0002-3421-9011Harinee Natarajan2https://orcid.org/0009-0009-9141-1625V. Balaswamy3https://orcid.org/0000-0002-7732-3452Varun Raghunathan4https://orcid.org/0000-0002-0141-4032Department of Electrical Communication Engineering, Indian Institute of Science, Bengaluru, IndiaDepartment of Electrical Communication Engineering, Indian Institute of Science, Bengaluru, IndiaDepartment of Electrical Communication Engineering, Indian Institute of Science, Bengaluru, IndiaDepartment of Electrical Communication Engineering, Indian Institute of Science, Bengaluru, IndiaDepartment of Electrical Communication Engineering, Indian Institute of Science, Bengaluru, IndiaQuantum random number generators (QRNG) based on amplified spontaneous emission (ASE) are known to achieve multi-gigabit-per-second rates through high-speed sampling of intensity and phase fluctuations. Two popular implementations of these QRNGs are based on balanced detection of ASE-ASE and ASE-Laser beating. The high QRNG rates reported so far however come at the price of increased system complexity, making it a clear deterrent for widespread use. In this paper, we perform a direct one-to-one comparison study between ASE-ASE and ASE-Laser-based QRNGs using detailed theoretical modeling and supporting experiments, with the goal of achieving 1 Gbps QRNG using simple, low-bandwidth photodetectors and low sampling rate digitizers. We develop, for the first time to the best of out knowledge, closed-form analytical expressions to describe the signal variance as a function of realistic, non-ideal fiber-optic optical components, the signal correlations as a function of digitizer sampling rate, and minimum entropy as a function of signal variance. We observe a trade-off between the correlations in the detected signals and the sampling rate used, thereby obtaining an optimum sampling rate and hence the digitizer specification for extracting the best randomness. We also observe the standard deviation in the signal distribution is higher for ASE-Laser QRNG in comparison to the ASE-ASE implementation. Using off-the-shelf telecom fiber components, balanced detectors with bandwidth as low as 100 MHz, and an 8-bit digitizer operating at a sampling rate of 100 Megasamples-per-second (MSPS), we achieve QRNG rates of 546.03 Mbps and 507.94 Mbps for the ASE-ASE and ASE-Laser beating implementations respectively. The ASE-ASE QRNG rates are subsequently doubled to more than 1 Gbps using polarization multiplexing and bit-interleaving.https://ieeexplore.ieee.org/document/10460108/Quantum random number generatoramplified spontaneous emissionminimum entropyToeplitz hashing |
| spellingShingle | Shreyam Maity Asish Prosad Harinee Natarajan V. Balaswamy Varun Raghunathan Comparative Study of ASE-ASE and ASE-Laser Based Quantum Random Number Generators IEEE Photonics Journal Quantum random number generator amplified spontaneous emission minimum entropy Toeplitz hashing |
| title | Comparative Study of ASE-ASE and ASE-Laser Based Quantum Random Number Generators |
| title_full | Comparative Study of ASE-ASE and ASE-Laser Based Quantum Random Number Generators |
| title_fullStr | Comparative Study of ASE-ASE and ASE-Laser Based Quantum Random Number Generators |
| title_full_unstemmed | Comparative Study of ASE-ASE and ASE-Laser Based Quantum Random Number Generators |
| title_short | Comparative Study of ASE-ASE and ASE-Laser Based Quantum Random Number Generators |
| title_sort | comparative study of ase ase and ase laser based quantum random number generators |
| topic | Quantum random number generator amplified spontaneous emission minimum entropy Toeplitz hashing |
| url | https://ieeexplore.ieee.org/document/10460108/ |
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