Probabilistic quantum phase-space simulation of Bell violations and their dynamical evolution

TL;DR

This paper demonstrates that probabilistic phase space methods, specifically the positive P-representation, can effectively simulate Bell inequality violations and their dynamics, providing a new probabilistic approach to quantum paradoxes.

Contribution

The authors introduce a probabilistic phase space simulation method for Bell violations, including dynamical evolution, bridging quantum paradoxes with classical probabilistic frameworks.

Findings

Bell violations can be simulated using positive P-representation.

Quantum dynamics of Bell states can be modeled probabilistically.

The approach handles multi-mode generalizations of Bell states.

Abstract

Quantum simulations of Bell inequality violations are numerically obtained using probabilistic phase space methods, namely the positive P-representation. In this approach the moments of quantum observables are evaluated as moments of variables that have values outside the normal eigenvalue range. There is thus a parallel with quantum weak measurements and weak values. Nevertheless, the representation is exactly equivalent to quantum mechanics. A number of states violating Bell inequalities are sampled, demonstrating that these quantum paradoxes can be treated with probabilistic methods. We treat quantum dynamics by simulating the time evolution of the Bell state formed via parametric down-conversion, and discuss multi-mode generalizations.