Weak Gravitational Field Effects On Large-Scale Optical Interferometric Bell Tests

TL;DR

This paper investigates how weak gravitational fields influence large-scale optical interferometric Bell tests, demonstrating that gravitational effects can generate and sustain entanglement even with frequency dispersion.

Contribution

It introduces a novel analysis of gravitational effects on energy-time entangled states in large-scale interferometric setups, revealing conditions for entanglement generation due to gravitational time delays.

Findings

Gravitational time delay can induce entanglement in certain interferometric configurations.

Entanglement persists and Bell inequality violations occur despite frequency dispersion.

Large-scale interferometric arrays can be used to probe quantum-gravity interplay.

Abstract

The technological refinement of experimental techniques has recently allowed the generation of two-photon polarization-entangled states at low Earth orbit, which has been subsequently applied to quantum communications. This achievement paves the way to study the interplay between General Relativity and Quantum Mechanics in new setups. Here, we study the generation of two-photon energy-time entangled states via large scale Franson and Hugged interferometric arrays in the presence of a weak gravitational field. We show that for certain configurations of the arrays, an entangled state emerges as a consequence of the gravitational time delay. We also show that the aforementioned arrays generate entanglement and violate the Clauser-Horne-Shymony-Holt inequality under suitable conditions even in the presence of frequency dispersion.