Fig. 3
From: Multiplexed storage and real-time manipulation based on a multiple degree-of-freedom quantum memory
Multiplexed spin-wave storage in three degrees of freedom at the single-photon level. a The double AFC structure (red) in the MC and the double filter structure (black) in the FC. b Three independent spatial modes carrying different OAM states are employed for spatial multiplexing. The spatial mode s1 is converted into |L〉 state in SLM1. The spatial mode s2 is converted into |R〉 state in a spiral phase plate (SSP); the spatial mode s3 is a Gaussian mode which is used as |G〉 state. They are combined by two pellicle beam splitters (BS). c A demonstration of temporal, spectral and spatial multiplexed storage for single-photon level inputs
