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A liquid crystal (LC) cell made of silicon (Si) electrodes was fabricated to achieve self-routing of optical signals. As optical pulses (1.06 μm wavelength) passed through the cell, they excited free carriers in the Si electrode, which triggered the voltage application to the LC layer. Consequently, the polarization direction of the succeeding pulses became perpendicular to that of the preceding pulses,...
We discuss the role of physical fluctuations in physical random bit generators focusing on the practical limits of generation rates. First we present a brief review of existing random bit generators, their mechanisms and performance characteristics. Then we discuss in detail random bit generation by chaotic lasers. It has recently been shown that bit sequences which passed statistical tests of randomness...
Fast and reliable generation of non-deterministic random numbers is needed to improve the security of existing information and communication systems, including transactions on the internet and distributed data storage systems. Realising practical quantum key distribution systems in the future will also require high-speed generation of random sequences to modulate transmission parameters. Random physical...
We investigate the characteristics of fast random bit generation using chaotic semiconductor lasers. The optical amplitudes of two lasers with chaotic oscillations induced by optical feedback are each sampled at a fixed rate to extract binary bit sequences which are then combined by an exclusive-OR operation to obtain a single random bit sequence. Bit sequences generated at rate of 1 Giga bit per...
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