Please use this identifier to cite or link to this item:
Title: Finite-key security analysis of quantum key distribution with imperfect light sources
Authors: Mizutani, A
Curty, M
Lim, C.C.W 
Imoto, N
Tamaki, K
Keywords: Light
Light sources
Network security
Quantum optics
Security systems
Channel loss
Decoy state
Security analysis
State preparation
Theory and practice
Quantum cryptography
Issue Date: 2015
Publisher: Institute of Physics Publishing
Citation: Mizutani, A, Curty, M, Lim, C.C.W, Imoto, N, Tamaki, K (2015). Finite-key security analysis of quantum key distribution with imperfect light sources. New Journal of Physics 17 (9) : 93011. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: In recent years, the gap between theory and practice in quantum key distribution (QKD) has been significantly narrowed, particularly for QKD systems with arbitrarily flawed optical receivers. The status for QKD systems with imperfect light sources is however less satisfactory, in the sense that the resulting secure key rates are often overly dependent on the quality of state preparation. This is especially the case when the channel loss is high. Very recently, to overcome this limitation, Tamaki et al proposed a QKD protocol based on the so-called 'rejected data analysis', and showed that its security - in the limit of infinitely long keys - is almost independent of any encoding flaw in the qubit space, being this protocol compatible with the decoy state method. Here, as a step towards practical QKD, we show that a similar conclusion is reached in the finite-key regime, even when the intensity of the light source is unstable. More concretely, we derive security bounds for a wide class of realistic light sources and show that the bounds are also efficient in the presence of high channel loss. Our results strongly suggest the feasibility of long distance provably secure communication with imperfect light sources. © 2015 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
Source Title: New Journal of Physics
ISSN: 1367-2630
DOI: 10.1088/1367-2630/17/9/093011
Rights: Attribution 4.0 International
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
10_1088_1367-2630_17_9_093011.pdf1.95 MBAdobe PDF




checked on Aug 15, 2022

Page view(s)

checked on Aug 4, 2022

Google ScholarTM



This item is licensed under a Creative Commons License Creative Commons