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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.