# Fiber coupled EPR-state generation using a single temporally multiplexed squeezed light source

## TL;DR

This paper demonstrates the generation of fiber-coupled EPR entangled states using a single squeezed light source with temporal multiplexing, advancing scalable continuous variable quantum information processing in fiber networks.

## Contribution

It introduces a method to produce entangled quantum states in fiber using just one squeezed source and temporal multiplexing, simplifying large-scale quantum resource generation.

## Key findings

- Successful generation of fiber-coupled EPR entangled states
- Use of a single squeezed source with temporal multiplexing
- Enabling scalable in-fiber quantum information processing

## Abstract

A prerequisite for universal quantum computation and other large-scale quantum information processors is the careful preparation of quantum states in massive numbers or of massive dimension. For continuous variable approaches to quantum information processing (QIP), squeezed states are the natural quantum resources, but most demonstrations have been based on a limited number of squeezed states due to the experimental complexity in up-scaling. The number of physical resources can however be significantly reduced by employing the technique of temporal multiplexing. Here, we demonstrate an application to continuous variable QIP of temporal multiplexing in fiber: Using just a single source of squeezed states in combination with active optical switching and a 200 m fiber delay line, we generate fiber-coupled Einstein-Podolsky-Rosen entangled quantum states. Our demonstration is a critical enabler for the construction of an in-fiber, all-purpose quantum information processor based on a single or few squeezed state quantum resources.