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We investigate the maximum rates for transmitting quantum information,distilling entanglement, and distributing secret keys between a sender and areceiver in a multipoint communication scenario, with the assistance ofunlimited two-way classical communication involving all parties. First weconsider the case where a sender communicates with an arbitrary number ofreceivers, so called quantum broadcast channel. Here we also provide a simpleanalysis in the bosonic setting where we consider quantum broadcasting througha sequence of beamsplitters. Then, we consider the opposite case where anarbitrary number of senders communicate with a single receiver, so calledquantum multiple-access channel. Finally, we study the general case ofall-in-all quantum communication where an arbitrary number of senderscommunicate with an arbitrary number of receivers. Since our bounds areformulated for quantum systems of arbitrary dimension, they can be applied tomany different physical scenarios involving multipoint quantum communication.

General bounds for sender-receiver capacities in multipoint quantum communications