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Q: Fachverband Quantenoptik und Photonik

Q 45: Quantum Information (Quantum Communication) II

Q 45.1: Vortrag

Donnerstag, 14. März 2019, 10:30–10:45, S HS 002 Chemie

New insights in phase diffusion process in a gain-switched semiconductor laser for quantum random number generation (QRNG) — Brigitta Septriani, Oliver de Vries, and •Markus Gräfe — Fraunhofer Institute for Applied Optics and Precision Engineering IOF, Jena, Germany

Randomness is used for application in cryptography, stochastic simulation, gaming and gambling, and fundamental science experiments. Common practice is to generate random numbers from mathematical algorithm using Pseudo-random number generators. We are interested in tackling this problem with quantum technology. Phase diffusion in spontaneous emission events is a quantum phenomena 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 mainly focused on and motivated by the speed of the random number generations. Little has been stated about the performance of quantum phase noise as a randomness source in QRNG, from the perspective of the physics involved. We reanalyze the process of phase diffusion based QRNG and give a intuitive explaining picture of the underlying physics. Our findings show that a pulsed process is beneficial over the continuous-wave approach and give a upper bound of maximum random bit rate for a given experimental setting. 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.