This analysis derives achievable rate regions for classical feedback in quantum systems, indicating benefits for quantum binary adder MAC.
Classical communication over a quantum multiple access channel (MAC) is considered. Since the no-cloning prohibits universal copying of arbitrary quantum states, classical feedback is generated through measurement. An achievable rate region is derived using superposition block Markov coding and a quantum multiparty lemma for the analysis. Our region generalizes both the classical Cover-Leung region and the generalized feedback region. As an example, we show that the quantum binary adder MAC can benefit from feedback.
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Levi et al. (2025) studied this question.
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