Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5, 02-093, Warsaw, Poland.
Nat Commun. 2017 Dec 15;8(1):2140. doi: 10.1038/s41467-017-02366-7.
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 [Formula: see text] 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.
并行量子信息处理需要专门的量子存储器来同时处理多个光子。空间自由度是促进这种光子多路复用的一个很有前途的候选方案。我们使用单光子分辨相机，展示了一种基于冷原子系综的波矢多路复用量子存储器。通过观察拉曼散射光子之间的非经典相关性，在 665 个分离模式中同时证实了二阶相关函数 [Formula: see text] 的平均值。该协议利用多模存储器和相机，将促进多光子态的产生，这是量子增强传感技术的必要条件，也是光子量子电路的输入。
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