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Born rule: quantum probability as classical probability

Stoica, Ovidiu Cristinel (2022) Born rule: quantum probability as classical probability. [Preprint]

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Abstract

I provide a simple derivation of the Born rule as giving a classical probability, that is, the ratio of the measure of favorable states of the system to the measure of its total possible states.

In classical systems, the probability is due to the fact that the same macrostate can be realized in different ways as a microstate. Despite the radical differences between quantum and classical systems, I show that the same can be applied to quantum systems, and the result is the Born rule.

This works only if the basis is continuous, but all known physically realistic measurements involve a continuous basis, because they are based eventually on distinguishing positions.

The continuous basis is not unique, and for subsystems it depends on the observable.

But for the entire universe, there are continuous bases that give the Born rule for all measurements, because all measurements reduce to distinguishing macroscopic pointer states, and macroscopic observations commute. This allows for the possibility of an ontic basis for the entire universe.

In the wavefunctional formulation, the basis can be chosen to consist of classical field configurations, and the coefficients Ψ[ϕ] can be made real by absorbing them into a global U(1) gauge.

For the many-worlds interpretation, this result gives the Born rule from micro-branch counting.


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Item Type: Preprint
Creators:
CreatorsEmailORCID
Stoica, Ovidiu Cristinelholotronix@gmail.com0000-0002-2765-1562
Keywords: Born rule; state counting; Everett's interpretation; many-worlds interpretation; branch counting.
Subjects: Specific Sciences > Physics > Quantum Mechanics
Depositing User: Ovidiu Cristinel Stoica
Date Deposited: 13 Jan 2023 14:03
Last Modified: 13 Jan 2023 14:03
Item ID: 21654
Subjects: Specific Sciences > Physics > Quantum Mechanics
Date: 18 September 2022
URI: https://philsci-archive-dev.library.pitt.edu/id/eprint/21654

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