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Superadditivity of multiple access gaussian channels
Łukasz Czekaj, Jarek K. Korbicz, Ravindra W. Chhajlany, Paweł Horodecki
171 - 178
10.3233/978-1-60750-547-1-171
NATO Science for Peace and Security Series - D: Information and Communication Security
Volume 26: Quantum Cryptography and Computing
Abstract

We study classical capacity regions of quantum Gaussian multiple access channels (MAC). In classical variants of such channels, whilst some capacity superadditivity-type effects such as the so called water filling effect may be achieved, a fundamental classical additivity law can still be identified, viz. adding resources to one sender is never advantageous to other senders in sending their respective information to the receiver. Here, we show that quantum resources allow violation of this law, by providing an illustrative scheme of an experimentally feasible Gaussian MAC.

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