|| Private Classical Communication over Quantum Multiple-Access Channels
||Remi Chou, Wichita State University, United States|
||D2-S2-T4: Quantum Multiple Access Channels II
||Tuesday, 13 July, 22:20 - 22:40
||Tuesday, 13 July, 22:40 - 23:00
We study private classical communication over quantum multiple-access channels. For an arbitrary number of transmitters, we derive a regularized expression of the capacity region. In the case of degradable channels, we establish a single-letter expression for the best achievable sum-rate and prove that this quantity also corresponds to the best achievable sum-rate for quantum communication over degradable quantum multiple-access channels. Our achievability result decouples the reliability and privacy constraints, which are handled via distributed source coding with quantum side information at the receiver and distributed hashing, respectively. As a by-product of independent interest, we derive a distributed leftover hash lemma against quantum side information that ensures privacy in our achievability result.