Work

Entanglement-Assisted Covert Communication via Qubit Depolarizing Channels

Year: 2025

Type: article

Abstract: We consider entanglement-assisted communication over the qubit depolarizing channel under the security requirement of covert communication, where the transmission itself must be concealed from detection by an adversary. Previous work showed that$O(\sqrt {n})$information bits can be reliably and covertly transmitted innchannel uses without entanglement assistance. However, Gagatsos et al. (2020) showed that entanglement assistance can increase this scaling to$O(\sqrt {n}\log {n})$for continuous-variable bosonic channels. Here, we present a finite-dimensional parallel, and show that$O(\sqrt {n}\log {n})$covert bits can be transmitted reliably overnuses of a qubit depolarizing channel. The coding scheme employs “weakly” entangled states such that their squared amplitude scales as$O\left ({{{\scriptstyle \text {}^{\scriptstyle 1}}\hspace {-0.224em}/\hspace {-0.112em}{\scriptstyle \sqrt {n}}}}\right)$.

Source: IEEE Transactions on Information Theory

DOI: 10.1109/tit.2025.3546191

Authors: Elyakim Zlotnick, Boulat A. Bash, Uzi Pereg

Institutions: Technion – Israel Institute of Technology, University of Arizona

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,645

Funders: National Science Foundation, Deutsche Forschungsgemeinschaft, Israel Science Foundation, Planning and Budgeting Committee of the Council for Higher Education of Israel