Quantum random-number generators (QRNGs), based on the principles of quantum mechanics, are capable of producing truly unpredictable random numbers and have wide applications in many fields. As a key index, QRNGs with high generation speed across various scenarios are becoming increasingly needed. However, in conventional time-domain processing, the generation rate of high-speed QRNGs is limited by the bandwidth and sampling rate of electrical devices. In this work, we propose a quantum random-number generation scheme based on frequency-domain processing. By partitioning the power spectrum of phase noise into four nonoverlapping frequency bands for independent extraction and processing, we realize parallel multichannel output of random numbers. Finally, we experimentally validate our scheme and generate random numbers with rates of 44 and 52 Gbit/s in digital and analog processing, respectively. More importantly, for the generation rate of 52 Gbit/s, only devices with a bandwidth of 1 GHz and a sampling rate of $2\times {10}^9$ samples per second are used, which increases the random-bit generation rate 26 times. Thus, our method could significantly increase the generation rate with low bandwidth and low sampling rate.

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• Optical quantum information processing
• Optoelectronics
• Quantum cryptography
• Quantum fluctuations & noise
• Quantum measurements
• Quantum optics
• Multiplexers