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Table 3 SPEQS-CS specifications (GomX-2 version) and design envelopes for upcoming devices

From: Nanosatellite experiments to enable future space-based QKD missions

  SPEQS-CS [31] SPEQS - 1 SPEQS - 2
Brightness 3,000 3,000 1,000,000
Visibility 96% 96% 96%
Efficiency 1% 1% 20%
Power (peak) 2.5 W 2.5 W 10 W
Mass 0.3 kg 0.8 kg 1 kg
Volume 0.25U 0.5U 0.8U
  1. Brightness refers to the number of detected photon pairs per second per milliwatt. Visibility is a measure of the quality of the photon pairs produced and efficiency refers to percentage of coincident pairs to single photons detected.