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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Ultrafast Parallel Random Number Generation with a Chip-Scale Semiconductor Laser

Hui W. Cao

Published Jul 31, 2022• 0 citations
Publisher

Abstract

We employ spatio-temporal interference of many lasing modes for ultrafast and scalable random number generation. The laser diode with specially-designed cavity produces hundreds of bit streams on a total rate two orders-of-magnitude faster than state-of-the-art.
DOI
10.1109/cleo-pr62338.2022.10432675

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We design and fabricate a stable cavity for a highly multimode semiconductor laser. After suppressing the lasing instabilities, we utilize the spatio-temporal interference of numerous lasing modes to create ultrafast random intensity fluctuation in space and time. By spatial multiplexing of the laser emission, we produce 127 statistically independent parallel bit streams from a chip-scale laser. The total bit rate reaches 250 Terabit/s, two orders-of-magnitude faster than the state-of-the-art. The unpredictability and non-reproducibility of random bits are guaranteed by spontaneous emission noise originating from quantum fluctuations. Our scheme is robust, compact, and energy-efficient with applications in cybersecurity and stochastic modeling.
Optoelectronics The security of our digital networks is underpinned by the ability to generate streams of random numbers or bits. As networks expand in an ever-connected way, the challenge is to increase the generation rate of the random numbers to keep pace with demand. Kim et al. designed a chip-scale laser diode that generates random bits at an ultrahigh rate (see the Perspective by Fischer and Gauthier). By tailoring the geometry of the cavity, they were able to exploit the spatiotemporal interference of many lasing modes to generate picosecond-scale emission intensity fluctuations in space and time, producing ultrafast random bit streams in parallel. Such a device will find a wide range of applications requiring an ultrafast, compact, robust, and energy-efficient random bit generator. Science , this issue p. [948][1]; see also p. [889][2] [1]: /lookup/doi/10.1126/science.abc2666 [2]: /lookup/doi/10.1126/science.abg5445