*Physics is to be regarded not so much as the study of something a priori given, but rather as the development of methods for ordering and surveying human experience.*

— Niels Bohr

*Dobbiamo inventare il mondo per inquadrarvi le nostre sensazioni, ma non dovremo mai considerarlo come uno schema rigido e fisso, come una costruzione definitiva: esso non è che il risultato provvisorio di uno sforzo di sintesi.*

— Bruno de Finetti

At the heart of two basic theories of physics, quantum theory and statistical mechanics, lies the concept of probability. In the modern Bayesian view, probability theory in turn constitutes an extension of logic: Rather than merely describing limits of relative frequencies, it is regarded much more broadly as a framework for reasoning in the absence of full information. Do some of our fundamental laws of physics therefore reflect but "laws of thought": consistency requirements of some – at times counterintuitive – algorithm for plausible reasoning?

This conceptual issue has practical implications. For instance, ongoing research in the fast-growing field of quantum computation and quantum information keeps revealing intimate connections of quantum theory with, and its potential power for, highly efficient information processing.

It is these questions which drive much of my thinking, writing and teaching. I invite you to browse these pages for a snapshot of current progress.

Welcome!

Jochen Rau