Abstract:
:One of the challenges of implementing free-space quantum key distribution (QKD) systems working in daylight is to remove unwanted background noise photons from sunlight. Elaborate elimination of background photons in the spectral, temporal, and spatial domains is an indispensable requirement to decrease the quantum bit error rate (QBER), which guarantees the security of the systems. However, quantitative effects of different filtering techniques and performance optimization in terms of the secure key rate have not been investigated. In this study, we quantitatively analyze how the performance of the QBER and the key rates changes for different combinations of filtering techniques in a free-space BB84 QKD system in daylight. Moreover, we optimize the conditions of filtering techniques in order to obtain the maximum secure key rate.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Ko H,Kim KJ,Choe JS,Choi BS,Kim JH,Baek Y,Youn CJdoi
10.1038/s41598-018-33699-ysubject
Has Abstractpub_date
2018-10-17 00:00:00pages
15315issue
1issn
2045-2322pii
10.1038/s41598-018-33699-yjournal_volume
8pub_type
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