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Table 1 Comparison of published results of various SPDC sources

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

Paper Type Brightness pairs/s/mm/mW Collection efficiency % Notes
Kwiat et al. [18] II 3.3   
Kwiat et al. [19] I 119 5  
Fiorentino [20] II 82   
Fedrizzi et al. [21] II 2,600 32  
Trojek and Weinfurter [22] I 2,310   
Trojek and Weinfurter [22] I 1,688 39  
Rangarajan et al. [23] I 11,200   BiBo crystal
Steinlechner et al. [24] I 102,000 19 10 μW pump
Da Cunha Pereira et al. [25] II 268 42 *
Dixon et al. [26] II 300 50 *
Steinlechner et al. [27] 0 50,000 45  
Steinlechner et al. [27] II 400 45  
Septriani et al. [28] I 1,875 30 *
  1. The collection efficiency (ratio of detected pairs to single photons) of a source is an important parameter, but one that is not always quoted in papers. Entries marked * indicate sources that produce correlated photon pairs that are not entangled in polarisation.