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

Kavli Affiliate: Nergis Mavalvala

| First 5 Authors: Eleonora Polini, Piotr Chruściel, Georgi Dvali, Christopher Hilweg, Begüm Kabagöz

| Summary:

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.

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