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

Michał Parniak (), Michał Dąbrowski (), Mateusz Mazelanik, Adam Leszczyński, Michał Lipka and Wojciech Wasilewski
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Michał Parniak: Institute of Experimental Physics, Faculty of Physics, University of Warsaw
Michał Dąbrowski: Institute of Experimental Physics, Faculty of Physics, University of Warsaw
Mateusz Mazelanik: Institute of Experimental Physics, Faculty of Physics, University of Warsaw
Adam Leszczyński: Institute of Experimental Physics, Faculty of Physics, University of Warsaw
Michał Lipka: Institute of Experimental Physics, Faculty of Physics, University of Warsaw
Wojciech Wasilewski: Institute of Experimental Physics, Faculty of Physics, University of Warsaw

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: 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 $$g_{{\mathrm{S,AS}}}^{{\mathrm{(2)}}} = 72 \pm 5$$ g S,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.

Date: 2017
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DOI: 10.1038/s41467-017-02366-7

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