A method and device for quantifying the randomness of physical entropy sources

Abstract

The present invention relates to the field of entropy value quantification of physical entropy sources, and provides a method and device for quantifying the randomness of physical entropy sources. The method includes the following steps: S1, collecting time series data {x of physical entropy sources t , t=1,...,N}, N represents the length of the time series data; S2, determine the value of the embedding dimension d and the value of the embedding delay time τ, the embedding delay time τ is the time interval between the time series values ​​in the vector, Its value is an integer multiple of the signal sampling period; S3, select N-(d-1)τ vectors T from the time series data S , collecting each vector T S The order of size of all elements in , count the number of vectors in various order of size, and calculate the probability of each order; S4, calculate the sorting entropy of the time series data. The invention collects the time-series intensity signal of the light field, uses the sorting entropy to quantify the randomness and complexity of the entropy source, is easy to implement, has faster analysis and calculation speed, and has higher system robustness.

Description

technical field [0001] The invention belongs to the field of entropy value quantification of physical entropy sources, and in particular relates to a device and method for quantizing the randomness of chaotic laser and shot noise by using sorting entropy. Background technique [0002] There is always microscopic noise in real physical systems, so the system is randomly perturbed. If the deterministic part of the system is strongly chaotic, the initial uncertainty caused by noise will be rapidly and dynamically amplified, making macroscopic observables unpredictable after a long time. A semiconductor laser with external cavity feedback (EDF-SL) is an infinite-dimensional dynamical system that can output high-dimensional chaotic signals. On nanosecond time scales, this chaotic laser system rapidly amplifies the random perturbations of the inherent noise, causing the intensity of the system output to oscillate randomly. Based on this randomness, chaotic lasers have great deve...

AI Technical Summary

Problems solved by technology

This entropy estimation method is affected by the quantization threshold level, and does not directly reflect the entropy increase time of the entropy source

At present, the analysis of randomness directly from the optical feedback chaotic laser output signal only involves the study of time delay eigenvalues.

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