High-Sensitivity Fiber Interferometer for Gravitational Phase Shift Measurement on Entangled States

TL;DR

This paper reports on an experiment using a fiber interferometer to measure gravitational phase shifts on entangled photons, bridging quantum mechanics and general relativity.

Contribution

First experimental measurement of gravitational phase shift on massless entangled particles using a kilometer-scale fiber interferometer.

Findings

Successful detection of gravitationally induced phase differences

First demonstration on massless particles in such a setup

Advances understanding of quantum gravity effects

Abstract

In this contribution, we describe the status of our experiment aimed at measuring the gravitationally induced phase shift on path-entangled photons. We use a kilometer-scale fiber interferometer whose arms are vertically displaced in the Earth gravitational potential, allowing photons propagating at different heights to accumulate different phases. To date, this is the first experiment to measure this effect on massless particles, thereby experimentally combining general relativity and quantum mechanics.