Security analysis of quantum key distribution on passive optical networks

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Needs for providing security to end users have brought installation of quantum key distribution (QKD) in one-to-many access networks such as passive optical networks. In the networks, a presence of optical power splitters makes issues for secure key rate more important. However, researches for QKD in access networks have mainly focused on implementation issues rather than protocol development for key rate enhancement. Since secure key rate is theoretically limited by a protocol, researches without protocol development cannot overcome the limit of secure key rate given by a protocol. This brings need of researches for protocol development. In this paper, we provide a new approach which provides secure key rate enhancement over the conventional protocol. Specifically, we propose the secure key rate formula in a passive optical network by extending the secure key rate formula based on the decoy-state BB84 protocol. For a passive optical network, we provide a way that incorporates cooperation across end users. Then, we show that the way can mitigate a photon number splitting (PNS) attack which is crucial in an well known decoy BB84 protocol. Especially, the proposed scheme enables multiphoton states to serve as secure keys unlike the conventional decoy BB84 protocol. Numerical simulations demonstrate that our proposed scheme outperforms the decoy BB84 protocol in secure key rate. (C) 2017 Optical Society of America
Publisher
OPTICAL SOC AMER
Issue Date
2017-05
Language
English
Article Type
Article
Keywords

FIELD-TEST; PON

Citation

OPTICS EXPRESS, v.25, no.10, pp.11894 - 11909

ISSN
1094-4087
DOI
10.1364/OE.25.011894
URI
http://hdl.handle.net/10203/225255
Appears in Collection
EE-Journal Papers(저널논문)
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