Probabilistic simulation of mesoscopic "Schr\"odinger cat" states

TL;DR

This paper demonstrates probabilistic phase-space sampling of mesoscopic Schr"odinger cat states, revealing multipartite Bell violations and super-decoherence dynamics, with implications for quantum simulation efficiency.

Contribution

It introduces a novel probabilistic sampling method for mesoscopic Schr"odinger cat states, enabling analysis of Bell violations and decoherence in large quantum systems.

Findings

Multipartite Bell violations observed up to 60 qubits.

Sampling errors are analyzed for accuracy and reliability.

Simulation of super-decoherence dynamics in ion traps.

Abstract

We carry out probabilistic phase-space sampling of mesoscopic Schr\"odinger cat quantum states, demonstrating multipartite Bell violations for up to 60 qubits. We use states similar to those generated in photonic and ion-trap experiments. These results show that mesoscopic quantum superpositions are directly accessible to probabilistic sampling, and we analyze the properties of sampling errors. We also demonstrate dynamical simulation of super-decoherence in ion traps. Our computer simulations can be either exponentially faster or slower than experiment, depending on the correlations measured.