Dear Matthew Leifer,

Thank you very much for your comments. These are very helpful for me. In general I agree with your remarks but some points are to be discussed.

In general, it is clear that QM must be an applied probability theory and it is clear that this probability theory cannot be the Kolmogorovian probability theory.

1. The first…[Read more]

Dear Shan,

I have a comment and a critical remark to your argumentation.

I shall consider the property (C1) in the more complete formulation:
(C1x) the wave function of a physical system is a complete description of the individual system.
You write “The first approach is to deny the claim (C1), and add some additional variables …”.
I think…[Read more]

jiri soucek,

I am somewhat sympathetic to the view that quantum theory should be understood in terms of some sort of non-Kolmogorovian probability theory. However, there are a couple of problems with this.

First, it is not just since 2008 that this option has existed. There are currently a few dozen competing generalized probability theories…[Read more]

Hi Shan,

Turning back to your question in #3303, concerning randomness:

A central point of the paper I posted in this forum is that all of the probabilities in retrocausal quantum models can be classical/conventional in the sense that they all result from a lack of knowledge. But there are two different parts of this. First is the knowledge…[Read more]

Shan,

“In fact, the writing of this paper is mainly motivated by your words in your review paper. You said, “A straightforward resolution of the collapse of the wavefunction, the measurement problem, Schrodinger’s cat
and friends is one of the main advantages of psi-epistemic interpretations…. The measurement problem is not so much resolved by ps…[Read more]

Dear Matthew,

I have some comments

1) The very idea of the ontological models is based on the assumption that there exists only one probability theory – the standard Kolmogorov theory. But from 2008 there exist two probability theories – the Kolmogorov (linear) probability theory and the new quadratic probability theory published in…[Read more]

Dear Shan,

I am suprised that you consider the psi-epistemic view together with the idea that all observables have pre-existing values.
I understand the psi-ontic view as the standard assumption that each pure state represents the possible state of an individual system. For me the psi-epistemic view means that not all pure states represent the…[Read more]