Quantum Advantage in Multiple Access Wiretap Channels with Entangled Transmitters

Abstract:We investigate secure communication over a classical multiple-access wiretap channel (MAC-WTC), specifically exploring the benefit of shared entanglement between the transmitters. Under the strict semantic security criterion, we derive an achievable rate region and a regularized expression for the secrecy capacity. We further establish a single-letter upper bound on the secure capacity of the MAC-WTC with entangled transmitters. Our results demonstrate that entanglement strictly enlarges the secrecy capacity of MAC-WTC compared to sharing only classical correlated randomness, a finding we illustrate using a pseudo-telepathy game example. Finally, we establish new strong soft-covering lemmas for the output statistics of multipleaccess channels (MACs) with entangled transmitters. Our results generalize existing results for non-entangled systems.

Information Theory (cs.IT); Quantum Physics (quant-ph)

arXiv:2609.06808 [cs.IT]

(or arXiv:2609.06808v1 [cs.IT] for this version)

https://doi.org/10.48550/arXiv.2609.06808 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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