Table 1 Comparison of the average detection counts per second and their standard deviations during the night and daytime each measured for 10 min.

From: Experimental filtering effect on the daylight operation of a free-space quantum key distribution

 

Noise Mean (Std. Dev.)

Noise + Signal Mean (Std. Dev.)

Night

1,415 (59)

959,956 (20,406)

Daytime

578,565 (12,656)

1,548,087 (48,757)

  1. All represented data are the summation of the detection counts of the four-channel SPD, monitored at the counter. The same filtering techniques were applied for all cases as described in our baseline noise elimination setting except for the temporal one. The noise counts represent the number of detection events without QKD operation, which are solely caused by the scattered noise photons and dark counts of the SPD. The summation of noise and signal counts represents the number of detection events with QKD operation where background noise photons and quantum signals coexist. Std. Dev.: standard deviation.
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