# Characterizing nonlocal dispersion compensation in deployed telecommunications fiber

## TL;DR

This paper demonstrates nonlocal dispersion compensation in deployed telecommunication fibers using entangled photon pairs, preserving timing correlations over long distances without negative dispersion.

## Contribution

It introduces a method to achieve nonlocal dispersion compensation exploiting entanglement and fiber dispersion properties, without adding negative dispersion.

## Key findings

- Preservation of photon timing correlations over 10km deployed fiber
- Successful compensation over 80km laboratory fiber
- Utilization of time-energy entanglement for dispersion management

## Abstract

Propagation of broadband photon pairs over deployed telecommunication fibers is used to achieve nonlocal dispersion compensation without the deliberate introduction of negative dispersion. This is made possible by exploiting time-energy entanglement and the positive and negative dispersive properties of the fiber. We demonstrate preservation of photon timing correlations after transmission over two multi-segment 10km spans of deployed fiber and up to 80km of laboratory-based fiber.