# Experimental characterization of photon-number noise in Rarity-Tapster type interferometers

## TL;DR

This paper models and experimentally verifies photon-number noise in Rarity-Tapster interferometers, analyzing its impact on quantum teleportation performance with detailed signal-to-noise and photon generation data.

## Contribution

It introduces a simple model for photon-number noise in Rarity-Tapster interferometers and experimentally validates its predictions, providing insights into noise effects on quantum teleportation.

## Key findings

- Photon-number noise can be accurately modeled and measured.
- Signal-to-noise ratios depend on setup parameters.
- Photon noise impacts quantum teleportation fidelity.

## Abstract

In this paper, we develop a simple model describing inherent photon-number noise in Rarity-Tapster type interferometers. This noise is caused by generating photon pairs in the process of spontaneous parametric down-conversion and adding a third photon by attenuating fundamental laser mode to single-photon level. We experimentally verify our model and present resulting signal to noise ratios as well as obtained three-photon generation rates as functions of various setup parameters. Subsequently we evaluate impact of this particular source of noise on quantum teleportation which is a key quantum information protocol using this interferometric configuration.