Scientists develop laser system that generates random numbers at ultrafast speeds

NTU scientists develop laser system that generates random numbers at ultrafast speeds
Professor Wang Qijie, the lead scientist in the development of the laser system, pictured with a prototype. Credit: NTU Singapore

An international team of scientists has developed a system that can generate random numbers over a hundred times faster than current technologies, paving the way towards faster, cheaper, and more secure data encryption in today's digitally connected world.

The random system was jointly developed by researchers from Nanyang Technological University, Singapore (NTU Singapore), Yale University, and Trinity College Dublin, and made in NTU.

Random numbers are used for a variety of purposes, such as generating data encryption keys and one-time passwords (OTPs) in everyday processes such online banking and e-commerce to shore up their security.

The system uses a laser with a special hourglass-shaped cavity to generate random patterns, which are formed by light rays reflecting and interacting with each other within the cavity. By reading the patterns, the system generates many series of at the same time (see Image 1).

The researchers found that like snowflakes, no two sequences generated using the system were the same, due to the unpredictable nature of how the light rays reflect and interact with each other in the cavity.

The laser used in the system is about one millimeter long, smaller than most other lasers. It is also energy efficient and can be operated with any household power socket, as it only requires a one-ampere (1A) current.

NTU scientists develop laser system that generates random numbers at ultrafast speeds
Professor Wang Qijie, the lead scientist in the development of the laser system, pictured with a close-up of the prototype. Credit: NTU Singapore

In their study published in one of the world's leading scientific journals Science on 26 February 2021, the researchers verified the effectiveness of their random number generator using two tests, including one published by the US National Institute of Standards and Technology.

The research team has proven that the NTU-made which is faster and more secure than existing comparable technologies, could help safeguard users' data in a world that is steadily relying more on Internet transactions (see Image 2).

Professor Wang Qijie from NTU's School of Electrical and Electronic Engineering & School of Physical and Mathematical Science, as well as The Photonics Institute, who led the NTU team involved in the international research, said, "Current random number generators run by computers are cheap and effective. However, they are vulnerable to attacks, as hackers could predict future number sequences if they discover the algorithm used to generate the numbers. Our system is safer as it uses an unpredictable method to generate numbers, making it impossible for even those with the same device to replicate."

NTU scientists develop laser system that generates random numbers at ultrafast speeds
The NTU-designed system records light patterns caused by the reflection of a laser beam, which it then uses to generate a series of random numbers. Credit: NTU Singapore

Dr. Zeng Yongquan, a Research Fellow from NTU's School of Physical and Mathematical Sciences, who co-designed the laser system, said: "Our system surpasses current random number generators, as the method can simultaneously generate many more random sequences of information at an even faster rate."

The team's laser system can also generate about 250 terabytes of random bits per second—more than a hundred times faster than current computer-based random number generators.

The files illustrate our laser structure, the spatio-temporal interference of lasing modes to generate random intensity fluctuations for parallel random number generation. Credit: Kyungduk Kim

At its speed, the system would only take about 12 seconds to generate a body of random numbers equivalent to the size of information in the largest library in the world—the US Library of Congress.

Elaborating on the future of the system, the team is working on making the technology ready for practical use, by incorporating the into a compact chip that enables the random numbers generated to be fed directly into a computer.


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More information: "Massively parallel ultrafast random bit generation with a chip-scale laser," Science (2021). science.sciencemag.org/cgi/doi … 1126/science.abc2666
Journal information: Science

Citation: Scientists develop laser system that generates random numbers at ultrafast speeds (2021, February 25) retrieved 20 June 2021 from https://phys.org/news/2021-02-scientists-laser-random-ultrafast.html
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