Fig. 2: Memory efficiency.
From: Fast, noise-free atomic optical memory with 35-percent end-to-end efficiency
a, b Efficiency (storage and retrieval) versus the storage time for (a) on-resonance and (b) off-resonance storage, without the dressing field (blue) and with the dressing field (red). The left axis is the internal memory efficiency (ηint), and the right axis is the memory end-to-end efficiency (ηe2e) that includes the signal transmission through the entire memory setup. Circles are the measured data; the standard deviation of the mean of repeated measurements is smaller than the circles' size. The lines are fits to a model comprising exponential and Gaussian decays. The black arrows in (a) show the zero-time efficiency. For comparison, we show in gray the internal efficiency of FLAME-127 (see Memory characterization section for details).
