Figure 2: Storage of a true single photon carrying an OAM.
From: Single-photon-level quantum image memory based on cold atomic ensembles
(a) Image of a laser beam after traversing the spiral phase plate. The red line is the power-distribution curve along the transverse direction. (b) Cross-correlation between input signal and trigger photons, obtained by scanning the transverse position of the input signal; (c) cross-correlation function between retrieved signal and the trigger photons. The solid lines in (b) and (c) are theoretical fits. All data are raw, without noise.
