Quantum- and Classical Communication: Similarities, Differences and Application to Communication Networks

In this talk I will give a high-level overview of some similarities and differences between quantum- and classical communication systems. Our entrypoint will be discrete information theory as introduced by Shannon. Prior knowledge in this domain is assumed as given. We will introduce quantum information theory by analogy, and highlight the concept of entangled states. We will then explain how a quantum system transmits classical data, how it distributes entanglement and give an exemplary use of entanglement. The information-theoretic quantities that are used to benchmark these two tasks are the classical- and quantum capacity of a quantum channel. Some differences and simililarities to the Shannon capacity of a classical channel will be discussed. Concluding the theoretical overview, we will sketch the impact that a use of entanglement-assisted classical data transmission will have on the network layer of a public communication network. Finally, a short demonstration of how to simulate a simple quantum communication network using the emulator QuNetSim will be given together with an overview over the development of some of the associated hardware metrics.     «

In this talk I will give a high-level overview of some similarities and differences between quantum- and classical communication systems. Our entrypoint will be discrete information theory as introduced by Shannon. Prior knowledge in this domain is assumed as given. We will introduce quantum information theory by analogy, and highlight the concept of entangled states. We will then explain how a quantum system transmits classical data, how it distributes entanglement and give an exemplary use of...     »