Toward Practical Two-Way Covert Communication

Paul N. Fessatidis; Wyatt Wallis; Tae E. Cooper; Mark J. Meisner; Jaim Bucay; Saikat Guha; Shelbi L. Jenkins; Michael S. Bullock; Boulat A. Bash

arXiv · 2605.29840

Toward Practical Two-Way Covert Communication

Paul N. Fessatidis·Wyatt Wallis·Tae E. Cooper·Mark J. Meisner·Jaim Bucay·Saikat Guha·Shelbi L. Jenkins·Michael S. Bullock·Boulat A. Bash

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Abstract

We study two-way covert communication schemes, where information is transmitted by passively modulating a reflected signal back to the source. We consider optical systems, described by quantum bosonic channels. While broadband classical and quantum light sources offer high covert throughput in theory, the associated mode-matching and phase-synchronization requirements make them impractical. Therefore, we employ a narrowband laser source to experimentally demonstrate a proof-of-concept two-way covert communication system, where the adversary is assumed to be quantum-capable. Furthermore, we propose a correlator-based receiver that attains the broadband gain offered by a quantum light source without the need for precise mode matching.

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Paul N. Fessatidis, Wyatt Wallis, Tae E. Cooper, Mark J. Meisner, Jaim Bucay, Saikat Guha, Shelbi L. Jenkins, Michael S. Bullock, Boulat A. Bash. 2026-05-28. Toward Practical Two-Way Covert Communication. https://arxiv.org/abs/2605.29840

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