28 February 2012 Fast random-number generation using a diode laser's frequency noise characteristic
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Random numbers can be classified as either pseudo- or physical-random, in character. Pseudo-random numbers are generated by definite periodicity, so, their usefulness in cryptographic applications is somewhat limited. On the other hand, naturally-generated physical-random numbers have no calculable periodicity, thereby making them ideal for the task. Diode lasers' considerable wideband noise gives them tremendous capacity for generating physical-random numbers, at a high rate of speed. We measured a diode laser's output with a fast photo detector, and evaluated the binary-numbers from the diode laser's frequency noise characteristics. We then identified and evaluated the binary-number-line's statistical properties. We also investigate the possibility that much faster physical-random number parallel-generation is possible, using separate outputs of different optical-path length and character, which we refer to as "coherence collapse".
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Hiroki Takamori, Kohei Doi, Shinya Maehara, Kohei Kawakami, Takashi Sato, Masashi Ohkawa, Yasuo Ohdaira, "Fast random-number generation using a diode laser's frequency noise characteristic", Proc. SPIE 8255, Physics and Simulation of Optoelectronic Devices XX, 825521 (28 February 2012); doi: 10.1117/12.908011; https://doi.org/10.1117/12.908011

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