Order within disorder: spectral key generation and distribution in random lasers

TL;DR

This paper reveals that random lasers, traditionally seen as unpredictable, contain underlying orderly spectral patterns that can be exploited for secure key generation and distribution, combining randomness with determinism.

Contribution

The study demonstrates the existence of deterministic spectral patterns in random lasers using deep learning, enabling a novel secure communication scheme.

Findings

Spectral data of RLs contain recoverable inter-modal correlations.

RLs exhibit dual characteristics of randomness and determinism.

A new key generation and distribution scheme based on RL spectral properties.

Abstract

In secure communication, highly random entropy sources are essential for information security. Random lasers (RLs), which arise from multiple scattering in disordered structures, are potentially ideal entropy sources. Traditionally, RLs are viewed as disordered and unpredictable. However, in this work, we present novel evidence that orderly patterns exist beneath the seemingly disordered outputs of RLs. Utilizing deep learning techniques, a variety of advanced neural network models are used to analyze the spectral data in multiple dimensions. The results show that the time series of RLs spectra are unpredictable, but spectral wavelength component intensities can be recovered due to inter-modal correlations. This finding not only breaks through the traditional perception that RLs are unpredictable, but also reveals for the first time that RLs have the dual characteristics of both randomness and determinism. Based on this new characteristic, we further expand the application field of RLs and innovatively design a new type of key generation and distribution scheme. In this scheme, the disordered property of RLs is used for key generation to ensure high randomness, while their ordered property is used for key distribution to guarantee accuracy and reliability. The scheme provides a new strategy for secure communication.