Journal
SCIENCE
Volume 371, Issue 6532, Pages 948-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abc2666
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This study introduces a method for ultrafast generation of random bit streams using a single laser diode, achieving a total bit rate of 250 terabits per second with off-line postprocessing. The approach is robust, compact, energy-efficient, and has potential applications in secure communication and high-performance computation.
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.
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