2021-06-30

Scientists build the fastest real-time quantum random number generator to date: speed up to 18.8Gbps

By yqqlm yqqlm

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Scientists build the fastest real-time quantum random number generator to date: speed up to 18.8Gbps

For this reason, research teams around the world are working hard to find ways to make these devices run faster and more portable. What this article introduces is the integrated photonic chip built by the Jun Zhang team that is only fingertip-sized, and its random number output speed is more than twice that of the traditional QRNG.

This device combines the most advanced photonic integrated chip and optimized real-time post-processing technology, and uses it to extract randomness from the quantum entropy source of the vacuum state.

Scientists build the fastest real-time quantum random number generator to date: speed up to 18.8Gbps(1)

Research picture-2: QRNG module package And function schematics

The author of the paper, Jun Zhang, said: “The new integrated quantum photonics technology has shown significant advantages in reducing the size of QRNG devices. In this work, we have further demonstrated that this technology can be used for ultra-fast , And real-time quantum random number generation”.

In contrast, most current QRNGs use separate photons and electronic components. It is still a daunting challenge to integrate such components into a chip.

Jun Zhang added: “Quantum random numbers are unpredictable, unreproducible, and unbiased because their randomness stems from the inherent uncertainty of quantum physics.”

Scientists build the fastest real-time quantum random number generator to date: speed up to 18.8Gbps(2)

Research Picture-3: Different Oscillators HPF output/average power spectral density under equivalent power setting

In this new study, the team used indium germanium arsenide photodiodes on the chip and a transimpedance amplifier integrated on a silicon photonic chip , And multiple couplers and attenuators.

Combining these components allows QRNG to detect signals from quantum entropy sources with a significantly improved frequency response.

Jun Zhang pointed out: “In this work, what surprised us most is that the high-frequency response performance of the photonic integrated chip is better than expected.”

Scientists build the fastest real-time quantum random number generator to date: speed up to 18.8Gbps(3)

Research Picture-4: Raw Random Data Calculation of autocorrelation coefficients

Once random signals are detected, they will be processed by the field programmable logic gate array (FPGA), and real random numbers will be extracted from the original data.

Finally, the QRNG device can achieve a quantum random number generation rate close to 19 Gbps, and then it can be sent to any computer through an optical cable.

At present, the research team has reduced the chip size to 15.6×18 mm, which is significantly smaller than most current QRNG modules or instruments.

Looking forward, the research team hopes to create a faster and more compact device, paving the way for a more practical QRNG solution.