With non-signaling assistance, a channel with non-causal CSIT has the same capacity as if the receiver also knew the state, and broadcast channels behave as if the other user's message were receiver side information.
The Interference Channel with Entangled Transmitters
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abstract
This paper explores communication over a two-sender, two-receiver classical interference channel, enhanced by the availability of entanglement resources between transmitters. The central contributions are an inner and outer bound on the capacity region for a general interference channel with entangled transmitters. It addresses the persistent challenge of the lack of a general capacity formula, even in the purely classical case, and highlights the striking similarities in achievable rate expressions when assessing quantum advantages. Through a concrete example, it is shown that entanglement can significantly boost performance in certain types of channels.
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Virtual Signaling of CSIT via Non-Signaling Assistance
With non-signaling assistance, a channel with non-causal CSIT has the same capacity as if the receiver also knew the state, and broadcast channels behave as if the other user's message were receiver side information.