quantum multiple access wiretap channel: on the one-shot achievable secrecy rate regions

In this paper, we want to investigate classical-quantum multiple access wiretap channels (cq-ma-wtc) under one-shot setting. in this regard, we analyze the cq-ma-wtc using simultaneous position-based decoder for reliable decoding and using a newly introduced technique in order to decode securely. also, for the sake of comparison, we analyze the cq-ma-wtc using sen's one-shot joint typicality lemma for reliable decoding. the simultaneous position-based decoder tends to a multiple hypothesis testing problem. also, using convex splitting to analyze the privacy criteria in a simultaneous scenario becomes problematic. to overcome both problems, we first introduce a new channel that can be considered as a dual to the cq-ma-wtc. this channel is called a point-to-point quantum wiretap channel with multiple messages (pp-qwtc). in the following, as a strategy to solve the problem, we also investigate and analyze quantum broadcast channels (qbcs) under the one-shot setting.