Enhancing Sum Capacity via Quantum and No-Signaling Cooperation Between Transmitters

Abstract

We consider communication over discrete memoryless interference channels or multiple access channels without feedback, where transmitters exploit classical, quantum, or no-signaling cooperation. Previous works have shown that, for channels associated with pseudo-telepathy games, quantum or no-signaling cooperation can increase the sum capacity. However, a full characterization of channels admitting such an improvement remains open. Motivated by common features of previously studied examples, we propose a broader class of game-induced channels. In these channels, each input is a question-answer pair from a nonlocal game. When the inputs satisfy the game's winning condition, the channel has lower conditional output uncertainty, and the channel decomposes into parallel weakly symmetric subchannels with a unique capacity-achieving input distribution. We show that, for this class, quantum or no-signaling cooperation strictly increases the sum capacity whenever the associated game is a quantum or no-signaling pseudo-telepathy game, respectively. The proposed class recovers several previously studied channels and includes new examples.