The probabilistic world II : Quantum mechanics from classical statistics

TL;DR

This paper demonstrates how quantum systems, including qubits and particles, can emerge from classical probabilistic systems, challenging traditional views and offering new insights into quantum mechanics and computing.

Contribution

It provides explicit constructions showing quantum behavior arises from classical statistics, circumventing no-go theorems and avoiding non-locality or other non-classical concepts.

Findings

Quantum systems can be derived from classical probability distributions.

Unitary evolution can be realized in classical probabilistic automata.

Classical systems can explain quantum phenomena without non-locality.

Abstract

This work discusses simple examples how quantum systems are obtained as subsystems of classical statistical systems. For a single qubit with arbitrary Hamiltonian and for the quantum particle in a harmonic potential we provide explicitly all steps how these quantum systems follow from an overall ''classical" probability distribution for events at all times. This overall probability distribution is the analogue of Feynman's functional integral for quantum mechanics or for the functional integral defining a quantum field theory. In our case the action and associated weight factor are real, however, defining a classical probabilistic system. Nevertheless, a unitary time-evolution of wave functions can be realized for suitable systems, in particular probabilistic automata. Based on these insights we discuss novel aspects for correlated computing not requiring the extreme isolation of quantum computers. A simple neuromorphic computer based on neurons in an active or quiet state within a probabilistic environment can learn the unitary transformations of an entangled two-qubit system. Our explicit constructions constitute a proof that no-go theorems for the embedding of quantum mechanics in classical statistics are circumvented. We show in detail how subsystems of classical statistical systems can explain various ``quantum mysteries". Conceptually our approach is a straightforward derivation starting from an overall probability distribution without invoking non-locality, acausality, contextuality, many worlds or other additional concepts. All quantum laws follow directly from the standard properties of classical probabilities.