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Information Theory

The goal of information theory is to understand the role of information in physical systems and to use this understanding to solve everyday problems.

On the one hand, information theory concerns deeply fundamental questions about physical systems and how systems relate to each other from the perspective of how information is stored and exchanged. On the other hand, it forms one of the corner stones of modern communication technology by providing answers to questions such as: How well can we transmit information over a particular physical communication channel? How can we use quantum technology to improve communication tasks? How much information can we store in a physical system of a certain size? And, how much information can we extract after a certain time has elapsed?

CQT researchers have made many central contributions to quantum information theory. Among others, these contributions include the discovery of information causality (Nature 461, 1101-1104, 2009), work on entanglement and the foundations of statistical mechanics (Nature Physics 2, 754-758, 2006), and the finding that quantum information can be negative (Nature 436,673-676, 2005).