Contraction coefficients quantify the loss of distinguishability induced by a channel and provide a strong form of the data-processing inequality. While standard contraction coefficients ignore auxili...

Ian George, Christoph Hirche, Theshani Nuradha, and Mark M. Wilde, Quantum 10, 2115 (2026). In classical information theory, the Doeblin coefficient of a classical channel provides an efficiently computable...

Leibniz University Hannover will apply for University of Excellence status.

A fundamental question in information theory is to quantify the loss of information under a noisy channel. Partial orders and contraction coefficients are typical tools to that end, however, they are ...

Recently, a new definition for quantum $f$-divergences was introduced based on an integral representation. These divergences have shown remarkable properties, for example when investigating contractio...