Tight finite-key analysis of a practical decoy-state quantum key distribution with unstable sources

Wang, Yang; Bao, Wan-Su; Zhou, Chun; Jiang, Mu-Sheng; Li, Hongwei

doi:10.1103/physreva.94.032335

Cited by 38 publications

(29 citation statements)

References 60 publications

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“…In particular, we develop a novel technique to bound the deviation between the sum of correlated Bernoulli random variables and its expected value, which can be much tighter than the widely employed Azuma's inequality when the success probability is low. We remark that this procedure could be employed to obtain tighter bounds in QKD security analyses in which Azuma's inequality is typically used, such as those considering intensity fluctuations [34] or other source imperfections [33,[35][36][37]. Importantly, our numerical simulations show that the protocol can overcome the repeaterless bounds [6,7] for a block size of only 10 10 transmitted signals in nominal working conditions.…”

mentioning

confidence: 83%

Tight finite-key security for twin-field quantum key distribution

Lorenzo,

Navarrete,

Azuma

et al. 2019

Preprint

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mentioning

confidence: 83%

Tight finite-key security for twin-field quantum key distribution

Lorenzo,

Navarrete,

Azuma

et al. 2019

Preprint

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“…Afterwards, privacy amplification (PA) is performed to eliminate information leakage to Eve during EC and EV. An estimated final key rate is calculated using standard decoy-state method [37][38][39][40] to determine a PA factor, defined as the ratio of the estimated final key rate to the corrected key rate after EV. With the PA factor, an exact Toeplitz matrix is constructed to extract final secure keys from the corrected keys.…”

Section: Methodsmentioning

confidence: 99%

Integrating quantum key distribution with classical communications in backbone fiber network

Mao,

Wang,

Zhao

et al. 2017

Preprint

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Quantum key distribution (QKD) provides information-theoretic security based on the laws of quantum mechanics. The desire to reduce costs and increase robustness in realworld applications has motivated the study of coexistence between QKD and intense classical data traffic in a single fiber. Previous works on coexistence in metropolitan areas have used wavelength-division multiplexing, however, coexistence in backbone fiber networks remains a great experimental challenge, as Tbps data of up to 20 dBm optical power is transferred, and much more noise is generated for QKD. Here we present for the first time, to the best of our knowledge, the integration of QKD with a commercial backbone network of 3.6 Tbps classical data at 21 dBm launch power over 66 km fiber. With 20 GHz pass-band filtering and large effective core area fibers, real-time secure key rates can reach 4.5 kbps and 5.1 kbps for co-propagation and counter-propagation at the maximum launch power, respectively. This demonstrates feasibility and represents an important step towards building a quantum network that coexists with the current backbone fiber infrastructure of classical communications.

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“…This idea has already been used to optimize the early MDI-QKD protocols based on two-photon interference in asymmetric-loss scenarios [29] and has recently been applied to another type of TF-QKD protocol in [30]. Moreover, decoy-state based protocols affected by intensity fluctuations have already been studied in [31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Asymmetric twin-field quantum key distribution

2019

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Twin-Field (TF) quantum key distribution (QKD) is a major candidate to be the new benchmark for far-distance QKD implementations, since its secret key rate can overcome the repeaterless bound by means of a simple interferometric measurement. Many variants of the original protocol have been recently proven to be secure. Here, we focus on the TF-QKD type protocol proposed by Curty et al (2019 NPJ Quantum Inf. 5 64), which can provide a high secret key rate and whose practical feasibility has been demonstrated in various recent experiments. The security of this protocol relies on the estimation of certain detection probabilities (yields) through the decoy-state technique. Analytical bounds on the relevant yields have been recently derived assuming that both parties use the same set of decoy intensities, thus providing sub-optimal key rates in asymmetric-loss scenarios. Here we derive new analytical bounds when the parties use either two, three or four independent decoy intensity settings each. With the new bounds we optimize the protocol's performance in asymmetric-loss scenarios and show that the protocol is robust against uncorrelated intensity fluctuations affecting the parties' lasers.

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Tight finite-key analysis of a practical decoy-state quantum key distribution with unstable sources

Cited by 38 publications

References 60 publications

Tight finite-key security for twin-field quantum key distribution

Tight finite-key security for twin-field quantum key distribution

Integrating quantum key distribution with classical communications in backbone fiber network

Asymmetric twin-field quantum key distribution

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