English: I am a master’s student in Interdisciplinary Sciences at ETH writing my thesis in the QuIT group, I work on the so-called “Wigner’s Friend” scenario.

This scenario aims to include the observer/describer in a quantum theoretical description. This has the funny vibes of applying quantum theory to itself. If quantum theory was already a «theory of anything» in disguise, then it should in particular be able to describe observers. Therefore, we essentially probe where the theory conflicts with what we usually call an observer. This prompts us to define more precisely what we mean by the following notions:

Measurement, observer, system, state, information, probability, …

Doing so ultimately amounts to improving our mathematical model of physical experience.

The fine line is to see exactly where quantum theory breaks down in such scenarios while remaining close to the established formalism i.e. not breaking it while finding out what it is.

«He that breaks a thing to find out what it is has left the path of wisdom. » is a quote by an enchanting man called G. Graurock – and seemingly it also applies to oneself.