Towards better understanding of QBism

TL;DR

This paper offers an external perspective on QBism, incorporating feedback from its creators to clarify and refine understanding of QBism's delicate features, aiming to improve the discourse in quantum foundations.

Contribution

It provides a reflective analysis that incorporates direct feedback from QBism's creators to better understand and critique QBism's core ideas.

Findings

Clarifies delicate features of QBism

Incorporates feedback from QBists

Refines previous critical comments

Abstract

Recently I posted a paper entitled "External observer reflections on QBism". As any external observable, I was not able to reflect some features of QBism properly. Therefore comments which I received from one of its creators, C. Fuchs, are very valuable - to understand better the views of QBists. Some of QBism features are very delicate and to extract them from articles of QBists is not a simple task. Therefore I hope that the second portion of my reflection on QBism (or better to say my reflections on Fuchs' reflections on my reflections) might be interesting and useful for other experts in quantum foundations and quantum information theory (especially by taking into account my previous aggressively anti-QBism position). In the present paper I correct some of my previously posted critical comments on QBism. At the same time better understanding of QBists views on some problems leads to improvement and strengthening of other critical comments.