High-security learning-based optical encryption assisted by disordered metasurface

PLUTO / PLUTO-2 Spatial Light Modulators
Optical Communication Optical Computing / Quantum Optics
Published on:
Authors: Zhipeng Yu, Huanhao Li, Wannian Zhao, Po-Sheng Huang, Yu-Tsung Lin, Jing Yao, Wenzhao Li, Qi Zhao, Pin Chieh Wu, Bo Li, Patrice Genevet, Qinghua Song & Puxiang Lai
Abstract:

Artificial intelligence has gained significant attention for exploiting optical scattering for optical encryption. Conventional scattering media are inevitably influenced by instability or perturbations, and hence unsuitable for long-term scenarios. Additionally, the plaintext can be easily compromised due to the single channel within the medium and one-to-one mapping between input and output. To mitigate these issues, a stable spin-multiplexing disordered metasurface (DM) with numerous polarized transmission channels serves as the scattering medium, and a double-secure procedure with superposition of plaintext and security key achieves two-to-one mapping between input and output. In attack analysis, when the ciphertext, security key, and incident polarization are all correct, the plaintext can be decrypted. This system demonstrates excellent decryption efficiency over extended periods in noisy environments. The DM, functioning as an ultra-stable and active speckle generator, coupled with the double-secure approach, creates a highly secure speckle-based cryptosystem with immense potentials for practical applications.

Open Access

Publication: Nature Communications
Issue/Year: Nat Commun 15, 2607 (2024)
DOI: 10.1038/s41467-024-46946-w
Link: https://doi.org/10.1038/s41467-024-46946-w

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