# Wavevector multiplexed quantum memory via spatially-resolved single-photon detection

## TL;DR

This paper demonstrates a wavevector multiplexed quantum memory using a cold atomic ensemble and a single-photon resolving camera, enabling simultaneous handling of multiple photons through spatial multiplexing.

## Contribution

It introduces a novel spatially-resolved quantum memory protocol that leverages a single-photon camera for high-dimensional multiplexing in quantum information processing.

## Key findings

- Achieved nonclassical correlations in 665 modes simultaneously
- Recorded a high second-order correlation function $g_{S,AS}^{(2)}=72\u00b15$
- Enabled generation of multi-photon states for quantum technologies

## Abstract

Parallelized quantum information processing requires tailored quantum memories to simultaneously handle multiple photons. The spatial degree of freedom is a promising candidate to facilitate such photonic multiplexing. Using a single-photon resolving camera we demonstrate a wavevector multiplexed quantum memory based on a cold atomic ensemble. Observation of nonclassical correlations between Raman scattered photons is confirmed by an average value of the second-order correlation function $g_{\mathrm{{S,AS}}}^{(2)}=72\pm5$ in 665 separated modes simultaneously. The proposed protocol utilizing the multimode memory along with the camera will facilitate generation of multi-photon states, which are a necessity in quantum-enhanced sensing technologies and as an input to photonic quantum circuits.