Quantum Byzantine Multiple Access Channels

TL;DR

This paper explores the capacity of a quantum multiple-access channel under adversarial conditions where one transmitter acts maliciously, introducing a new model and deriving achievable communication rates.

Contribution

It introduces the Byzantine multiple-access classical-quantum channel model and derives achievable rates for communication despite malicious behavior.

Findings

Derived an achievable communication rate for the adversarial quantum channel.

Established a new model for quantum channels with malicious transmitters.

Provides foundational results for secure quantum communication in adversarial settings.

Abstract

In communication theory, attacks like eavesdropping or jamming are typically assumed to occur at the channel level, while communication parties are expected to follow established protocols. But what happens if one of the parties turns malicious? In this work, we investigate a compelling scenario: a multiple-access channel with two transmitters and one receiver, where one transmitter deviates from the protocol and acts dishonestly. To address this challenge, we introduce the Byzantine multiple-access classical-quantum channel and derive an achievable communication rate for this adversarial setting.