Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 7: Secure Communication & Computation I

FM 7.5: Talk

Monday, September 23, 2019, 15:15–15:30, 1009

Quantum random number generation by phase diffusion in gain-switched semiconductor laser - new insights — •Sakshi Sharma, Brigitta Septriani, Oliver de Vries, and Markus Gräfe — Fraunhofer Institute for Applied Optics and Precision Engineering IOF, Jena, Germany

Randomness is essential for applications such as cryptography, stochastic simulation, gambling, and fundamental science experiments. Conventionally, random numbers are generated from mathematical algorithms using Pseudo-random number generators. We are interested in tackling this problem with quantum technology. Phase diffusion in spontaneous emission events is a quantum phenomenon with inherent randomness. Implementations of this scheme using pulsed lasers can yield high-speed quantum random number generation (QRNG). The general interest in the laser phase diffusion QRNG setup has been motivated by the speed of the random number generations. We reanalyze the process of phase diffusion based QRNG and give an intuitive explaining picture of the underlying physics. Our findings show that a pulsed process is beneficial over the continuous-wave approach and give an upper bound of the maximum random bit rate for a given experimental setting. Furthermore, we show how the QRNG probability distribution is influenced by several experimental factors such as the quality of the interference process and the noise in the detection system. Our theoretical, as well as experimental findings can help to find physical standards for QRNG verification rather than the ones based on classical statistical information theory.