Mr. Shaojie Li Profile

Shaojie Li

at Tianjin Univ.

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Proceedings Article | 26 November 2023 Poster + Paper

5-bit all free space optical quantum random number generator

Shaojie Li, Jintao Fan, Xiaoxuan Zhu, Yang Lu, Minglie Hu

Proceedings Volume 12775, 127751L (2023) https://doi.org/10.1117/12.2688873

KEYWORDS: Quantum random number generation, Quantum optics, Free space optics, Free space, Quantum numbers, Optical parametric oscillators, Thermal stability, Quantum sources, Quantum simulation, Quantum reading

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Random numbers play an important role in many fields, such as computation, simulation and cryptography. The randomness inherent in quantum mechanics is a perfect source of entropy for a true random number generator. Nevertheless, many QRNG schemes require post-processing work to ensure randomness. On the other hand, the bit number of the QRNG is limited, which hamper its further applications. Here, we demonstrate a novel 5-bit all free space optical quantum random number generator based on a time-division-multiplexed degenerate optical parametric oscillator (DOPO), which does not need a complicated experimental environment and tedious post-processing work. By inserting a multi-pass cell into the optical parametric oscillator, the equivalent cavity length is calculated to be as long as 15 m, which corresponds to fifth of the separation times of pump pulses. As a result, 5 identical DOPO pulses are generated simultaneously. The randomness comes from phase responses of degenerate OPOs. Under threshold, the photons produced by optical parametric down conversion have random initial phase, while above threshold, stable oscillations occurs in one of the two possible phase states. Random number is reliably verified by measuring the relative phase states between DOPO output pulses and the original pump pulse using a fast response photodiode. All spatial structures have the advantages of higher stability and are less sensitive to temperature fluctuation. The bit number can be readily multiplied by increasing the cavity length of DOPO or the repetition rate of the pump laser source.

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