Fig. 2: Experimental efficiency of hyper-dimensional broadband memory.
From: AI-assisted hyper-dimensional broadband quantum memory with efficiency above 90% in warm atoms
a Temporal waveforms of the input (Sin, deep blue), write (W, yellow), the retrieved (SR, sky blue) and read (R, green) pulses in one-time memory. The Sin signal pulse is 20 ns, corresponding to a bandwidth of 50 MHz. b Memory efficiency ηm as a function of topological charge l of OAM, the blue triangle is the overall efficiency, the orange square and yellow circle represent the horizontal and vertical polarization path, these three curves exhibit overlap with each other. The purple inverted triangle represents the efficiency without spatial optimization. c The spatial patterns of Sin at the center of the atomic cell and SR with topological charge l from 1 to 5.
