Multiqubit entanglement due to quantum gravity

TL;DR

This paper explores how quantum gravity can generate multipartite entangled states among multiple masses, extending previous bipartite experiments to tripartite and larger systems, and analyzes their robustness and properties.

Contribution

It introduces a method to construct and analyze multipartite entangled states induced by quantum gravity, including GHZ and W states, and relates their entanglement to gravitational evolution phases.

Findings

Multipartite entangled states can be generated via quantum gravity.

The geometric measure quantifies the degree of multipartite entanglement.

Relationship established between entanglement and gravitational evolution phases.

Abstract

Quantum gravity between masses can produce entangled states in thought experiments. We extend the experiments to tripartite case and construct states equivalent to Greenberger- Horne-Zeilinger states and W states under stochastic local operations and classical communication. The entanglement relates to the evolution phases induced by gravitational interaction. When we involve more masses in the experiments, multipartite entangled states can be constructed in a similar way. We measure the degree of multipartite entanglement by calculating the geometric measure. We describe the relationship between geometric measure and the evolution phases. It helps in searching out the states with robust entanglement.