Question

Difference between quantum and classica probabilities?

Is it true in quantum world that all observable differences have same chance of becoming real?

Answer 1

en.wikipedia.org/wiki/Quantum_mechanics

Answer 2

I need an answer that talks about negative probabilities,
or directly answers my question.

Answer 3

Well, I would not say that they all have the same chance of becoming real. They are probabilities, but not all equal. For example it is possible, quantum mechanically speaking, that you could walk into a wall and quantum tunnel out of the other side. The probability of this is essentially zero since all of your particles would have to tunnel at the same time, the same distance, and then go back in their original configuration to remake you. While this is unlikely in the extreme, its probability is not zero. So to ask if all observable differences are equally likely, the answer is no. That being said, in true classical physics we live in a deterministic universe. There are no probabilities since the entire future of the universe was set into motion at the beginning. In QM, the boundary conditions only limit what can happen, not determine it directly.

Answer 4

The probability total of all possibilities must equal 1, and since as pointed out by egenriether,,some probabilities are very low, and some higher they must not all be equal.
MHO (my humble opinion).