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 gS,AS(2)=72±5 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.
@article{arxiv.1706.04426,
title = {Wavevector multiplexed quantum memory via spatially-resolved single-photon detection},
author = {Michał Parniak and Michał Dąbrowski and Mateusz Mazelanik and Adam Leszczyński and Michał Lipka and Wojciech Wasilewski},
journal= {arXiv preprint arXiv:1706.04426},
year = {2017}
}