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Suppose that $m$ senders want to transmit classical information to $n$receivers with zero probability of error using a noisy multipartitecommunication channel. The senders are allowed to exchange classical, but notquantum, messages among themselves, and the same holds for the receivers. Ifthe channel is classical, a single use can transmit information if and only ifmultiple uses can. In sharp contrast, we exhibit, for each $m$ and $n$ with$m\ge 2$ or $n\ge 2$, a quantum channel of which a single use is not able totransmit information yet two uses can. This latter property requires and isenabled by quantum entanglement.

Entanglement between Two Uses of a Noisy Multipartite Quantum Channel Enables Perfect Transmission of Classical Information