The Quantum Multiple-Access Channel with Cribbing Encoders

Communication over a quantum multiple-access channel (MAC) with cribbing encoders is considered, whereby Transmitter 2 performs measurement on system that entangled 1. Based the no-cloning theorem, perfect impossible. This leads to introduction of MAC model noisy cribbing. In causal and non-causal scenarios, before input 1 sent through channel. Hence, 2's may inflict "state collapse" for Achievable regions are derived each setting. Furthermore, regularized capacity characterization established robust cribbing, i.e. when contains all information input. Building analogy between relay channel, partial decode-forward region non-robust For classical-quantum encoders, determined classical input, cutset special case deterministic inner outer bounds coincide.