YPetz

The workshop YPetz is devoted to recent advances in quantum hypothesis testing and its connections with quantum communication theory, resource theories and quantum entropies. The aim of the meeting is to bring together established experts to discuss new methods, conceptual developments, and open problems in the field.

Topics covered by the workshop include:
Quantum hypothesis testing
Quantum Shannon theory, both one shot and asymptotic
Quantum entropies and divergences

Speakers:

Bjarne Bergh
Mario Berta
Fernando Brandão
Francesco Buscemi
Hao-Chung Cheng
Matthias Christandl
Marco Dalai
Omar Fawzi
Masahito Hayashi
Fumio Hiai
Christoph Hirche
Ke Li 
Milán Mosonyi 
Bartosz Regula 
Joseph Renes 
Roberto Rubboli 
David Sutter
Marco Tomamichel

You may wonder how the name “YPetz” came about. Apart from being a small tribute to Dénes Petz and his fundamental contributions to quantum hypothesis testing, there is also a small story behind it. During the open problems session of the 2025 Quantum Resources workshop in Jeju, South Korea, Marco Tomamichel walked onto the stage and uttered two words, and two words only: “Why Petz?” The eerie silence that followed made painfully clear that what was missing was an event whose attendees could appreciate this exquisitely hypothesis-testing question. He apparently meant something along the lines of: “why does the Petz–Rényi relative entropy show up in hypothesis testing?” In any case, if that was the intended meaning, almost no one in the audience got it. Somebody replied “why not”, and somebody else thought that he was talking about the Petz recovery map. And so, here is an attempt to bring us all together to answer his question, as well as many others.

This workshop is funded by the European Union (ERC StG ETQO Grant Agreement no. 101165230)