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Laser Resonators, Microresonators, and Beam Control

Tailoring semiconductor laser cavity for ultrafast parallel random number generation

Kyungduk Kim, Stefan Bittner, Yongquan Zeng, Stefano Guazzotti, Ortwin G. Hess, Qi Jie Wang, Hui W. Cao

Published Apr 1, 2022• 0 citations
Publisher

Abstract

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.

DOI
10.1117/12.2606219

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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.
Random numbers are widely used for information security, cryptography, stochastic modeling, and quantum simulations. Key technical challenges for physical random number generation are speed and scalability. We demonstrate a method for ultrafast generation of hundreds of random bit streams in parallel with a single laser diode. Spatiotemporal interference of many lasing modes in a specially designed cavity is introduced as a scheme for greatly accelerated random bit generation. Spontaneous emission, caused by quantum fluctuations, produces stochastic noise that makes the bit streams unpredictable. We achieve a total bit rate of 250 terabits per second with off-line postprocessing, which is more than two orders of magnitude higher than the current postprocessing record. Our approach is robust, compact, and energy-efficient, with potential applications in secure communication and high-performance computation.