High dimensional entanglement between a photon and a multiplexed atomic quantum memory

TL;DR

This paper demonstrates the experimental generation and verification of high-dimensional entanglement between a photon and a multiplexed atomic quantum memory, enhancing quantum communication capabilities.

Contribution

It introduces a method to generate and verify high-dimensional entanglement between photons and atomic memories in a multiplexed setup.

Findings

Successfully generated high-dimensional entanglement

Verified entanglement dimension using quantum witness and entanglement of formation

Observed violation of Bell-type inequality

Abstract

Multiplexed quantum memories and high-dimensional entanglement can improve the performance of quantum repeaters by promoting the entanglement generation rate and the quantum communication channel capacity. Here, we experimentally generate a high-dimensional entangled state between a photon and a collective spin wave excitation stored in the multiplexed atomic quantum memory. We verify the entanglement dimension by the quantum witness and the entanglement of formation. Then we use the high-dimensional entangled state to test the violation of the Bell-type inequality. Our work provides an effective method to generate multidimensional entanglement between the flying photonic pulses and the atomic quantum interface.