The Taub Faculty of Computer Science Events and Talks

Quantum communication has seen rapid development in the last decade, in both practice and theory. Recently, there is a growing interest in how quantum entanglement can assist classical networks, i.e., non-quantum communication systems. In particular, there are known examples of classical multi-user channels such that the sum rate with entangled transmitters is strictly higher than the best achievable sum rate without such resources. The present work studies a two-user classical multiple-access channel (MAC) with entanglement resources shared between the transmitters a priori. We determine the capacity region for the general MAC with entangled transmitters, and show that the previous results can be obtained as a special case. We also point out the following change of behavior. Without entanglement resources, Dueck (1978) showed that the relaxation of a message-average error criterion can lead to strictly higher achievable rates, when compared with a maximal error criterion. Here, however, we show that the capacity region with entangled transmitters is the same, whether we consider a message-average or a maximal error criterion. Uzi Pereg is an assistant professor at the Viterbi Faculty of Electrical and Computer Engineering (ECE) and the Hellen Diller Quantum Center in the Technion - Israel Institute of Technology. He was a postdoc at the Institute for Communications Engineering in the Technical University of Munich (TUM), and at the Munich Center for Quantum Science and Technology (2020-2022). He received his Ph.D. degree from the Technion in 2019. In September 2022, he joined the ECE faculty of the Technion. Uzi was awarded the Quantum Science and Technology Postdoc Fellowship of the Israel Council for Higher Education (CHE), the Seed Funding Grant of the Munich Center for Quantum Science and Technology (MCQST), the Chaya Career Advancement Chair, and the VATAT Fellowship for Junior Faculty Members in Quantum Science and Technology.