# Carbon Nanotubes as Cooper Pair Beam Splitters

## TL;DR

This paper demonstrates that carbon nanotube-based double quantum dots can act as tunable beam splitters for Cooper pairs, enabling new experiments with spin-entangled electrons in quantum optics-like setups.

## Contribution

It introduces a method to control Crossed Andreev Reflections in carbon nanotube devices, advancing quantum electron optics research.

## Key findings

- Evidence of tunable Crossed Andreev Reflections
- Device operation as Cooper pair beam splitters
- Potential for quantum optics experiments with entangled electrons

## Abstract

We report on conductance measurements in carbon nanotube based double quantum dots connected to two normal electrodes and a central superconducting finger. By operating our devices as beam splitters, we provide evidence for Crossed Andreev Reflections \textit{tunable in situ}. This opens an avenue to more sophisticated quantum optics-like experiments with spin entangled electrons.