Finite-key security analysis of quantum key distribution with imperfect light sources

Mizutani, Akihiro; Curty, Marcos; Lim, Charles Ci Wen; Imoto, Nobuyuki; Tamaki, Kiyoshi

doi:10.1088/1367-2630/17/9/093011

Title: Finite-key security analysis of quantum key distribution with imperfect light sources

Journal Article · Wed Sep 09 00:00:00 EDT 2015 · New Journal of Physics

DOI:https://doi.org/10.1088/1367-2630/17/9/093011· OSTI ID:1265669

Mizutani, Akihiro ^[1]; Curty, Marcos ^[2]; Lim, Charles Ci Wen ^[3]; Imoto, Nobuyuki ^[1]; Tamaki, Kiyoshi ^[4]

Osaka Univ. (Japan)
Univ. of Vigo (Spain)
Univ. of Geneva (Switzerland); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Nippon Telegraph and Telephone (NTT) Corporation, Japan

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1265669

Journal Information:: New Journal of Physics, Vol. 17, Issue 9; ISSN 1367-2630

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 40 works

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