Andrei Khrennikov

Experimenters working in quantum optics and neutron interferometry, quantum information technologies represent an important part of the team of invited speakers. In general, the conferences are planned as events unifying the efforts of experts in foundations, mathematical methods, and experimenters to clarify the fundamental questions of quantum theory and its future applications.

Historically, I can mention Christopher Fuchs as one of the creators of the series. In 2001 he came to Växjö with the great team, including Asher Pers, David Mermin, Daniel Greenberger, Lev Vaidman, Carlton Caves, Richard Josza, Lucien Hardy, Hery Folse, Arkady Plotnitsky and other bright physicists and philosophers. This event lifted the conference status enormously and attracted other top experts with the interest to quantum foundations, especially from USA. I also point to the "Austrian-branch" of the conference organizational efforts. Here Helmut Rauch and Gregor Weihs contributed a lot, during the last years the active participation of Anton Zeilinger and people from his lab also played the important role.

I also want to mention the stormy debates between Richard Gill and Jan-Åke Larsson from one side and Luigi Accardi and later also Karl Hess and Walter Philipp from another side during the initial stage of the conference series which were extremely important for clarification of positions of various groups of experts with respect the probabilistic structure of violations of Bell's inequality.

The participation of Gerard ´t Hooft supported essentially the position of researchers rejecting the conventional interpretation of quantum mechanics.

Växjö definitely played the crucial role in development of QBism. Here the Bayesian approach to quantum probabilities was actively advertised and debated.

Växjö-presentations also contributed a lot to development of the information approach to quantum theory by Mauro D'Ariano and his students.

I personally enjoyed lectures of Arkady Plotnitsky about views of Born, Heisenberg, and Schrödinger and recently Pauli. Nowadays not so many even experts read the original sources, so such lecturing is useful.

I really appreciate recent efforts of Alan Migdall and Sergey Polyakov from NIST, USA, to organize the top level experimental sessions.

Of course, the Växjö-series of conferences is the project of the great complexity and not without problems. For example, consider openness. Here I have to filter originality of mind from craziness. In some cases this is really a difficult task, because the difference is tinny, especially in the case of quantum foundations.

Another problem, at least for some physicists, that there are "too many philosophers". (In fact, they are one-three...) Some theoreticians are angry that there are too many experimental talks and so on. However, in general people are satisfied and many of them come to Växjö again and again.

• Quantum Information and Probability: From Foundations to Engineering (QIP), 2021
• Foundations of Quantum Mechanics and Technology (FQMT), 2017
• Quantum and Beyond (QB), 2016

• Towards Ultimate Quantum Theory (UQT), 2018