# Remote polarization entanglement generation by local dephasing and frequency upconversion

## TL;DR

This paper presents a novel scheme for generating remote photon polarization entanglement by transferring frequency correlations through local dephasing and up-conversion, enabling entanglement without direct interaction or Bell measurements.

## Contribution

The work introduces a new method to create and transfer entanglement remotely using local operations and frequency control, expanding quantum communication capabilities.

## Key findings

- Demonstrates how to generate polarization entanglement remotely without Bell measurements.
- Shows control of multi-path interference in frequency space for entanglement transfer.
- Provides a theoretical framework for probing frequency entanglement via polarization measurements.

## Abstract

We introduce a scheme for remote entanglement generation for the photon polarization. The technique is based on transferring the initial frequency correlations to specific polarization-frequency correlations by local dephasing and their subsequent removal by frequency up-conversion. On fundamental level, our theoretical results show how to create and transfer entanglement, to particles which never interact, by means of local operations. This possibility stems from the multi-path interference and its control in frequency space. For applications, the developed techniques and results allow for the remote generation of entanglement with distant parties without Bell state measurements and opens the perspective to probe frequency-frequency entanglement by measuring the polarization state of the photons.