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Table 2 Milestones leading to on-orbit QKD demonstrations

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

Year Milestone Mission Reference
2012 Basic miniature SPDC source High altitude balloon test [29]
2013 Correlated SPDC pair source High altitude balloon test [30]
2014 Space-qualified, correlated, SPDC source survives rocket explosion GomSpace GomX-2 CubeSat [31]
2015 Space-qualified, correlated, SPDC source in low earth orbit NUS Galassia CubeSat [32]
2017 Demonstration of entangled photon pair source in space CQT SpooQy-1 CubeSat [33]
2018 Demonstration of high-brightness entangled photon pair source in space CQT SpooQy-2 CubeSat [34]
  1. These missions test the space-worthiness of the devices in-situ and do not involve beaming photons outside the spacecraft. Future missions (at the time of writing) are italicised.