# Quantum detection of wormholes

## TL;DR

This paper proposes a quantum metrology method using coherent states and homodyne detection to detect distant wormholes by measuring tiny phase shifts in electromagnetic signals, even from far away.

## Contribution

It introduces a novel quantum sensing scheme capable of detecting wormholes through phase shift measurements with realistic, robust parameters.

## Key findings

- Detects wormholes via phase shifts in electromagnetic signals
- Effective over long distances with realistic interferometry parameters
- Robust to optical losses and initial state mixedness

## Abstract

We show how to use quantum metrology to detect a wormhole. A coherent state of the electromagnetic field experiences a phase shift with a slight dependence on the throat radius of a possible distant wormhole. We show that this tiny correction is, in principle, detectable by homodyne measurements after long propagation lengths for a wide range of throat radii and distances to the wormhole, even if the detection takes place very far away from the throat, where the spacetime is very close to a flat geometry. We use realistic parameters from state-of-the-art long-baseline laser interferometry, both Earth-based and space-borne. The scheme is, in principle, robust to optical losses and initial mixedness.