2018
DOI: 10.1063/1.5027030
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Simple 2.5 GHz time-bin quantum key distribution

Abstract: We present a 2.5 GHz quantum key distribution setup with the emphasis on a simple experimental realization. It features a three-state time-bin protocol based on a pulsed diode laser and a single intensity modulator. Implementing an efficient one-decoy scheme and finite-key analysis, we achieve record breaking secret key rates of 1.5 kbps over 200 km of standard optical fiber.

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Cited by 87 publications
(63 citation statements)
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References 23 publications
(22 reference statements)
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“…In this paper, we present an experiment that takes advantage of state-of-the-art performance on all fronts to push the limits to new heights. We rely on a new 2.5 GHz clocked setup [6], low-loss fibers, in-house-made highly efficient superconducting detectors [7] and last but not least a very efficient one-decoy state scheme [8]. Finally, we achieve an improvement of the secret key rate (SKR) by four orders of magnitudes with respect to a comparable experiment over 400 km.…”
mentioning
confidence: 99%
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“…In this paper, we present an experiment that takes advantage of state-of-the-art performance on all fronts to push the limits to new heights. We rely on a new 2.5 GHz clocked setup [6], low-loss fibers, in-house-made highly efficient superconducting detectors [7] and last but not least a very efficient one-decoy state scheme [8]. Finally, we achieve an improvement of the secret key rate (SKR) by four orders of magnitudes with respect to a comparable experiment over 400 km.…”
mentioning
confidence: 99%
“…We implement the protocol presented in Boaron et al [6]. For the sake of simplicity of the setup, we use a three-state time-bin scheme: two states in the Z basis (a weak coherent pulse in the first or the second timebin, respectively) and one state in the X basis (a superposition of two pluses in both time-bins).…”
mentioning
confidence: 99%
“…The security of key bits are information-theoretical benefiting from their physical generating process [2,3]. A lot of research works have been devoted to get higher secure key rate (SKR), longer secure transmission distance in a QKD point-to-point link [4][5][6][7][8], as well as more flexible connections and higher user capacities in QKD networks [9][10][11][12]. The photonic layer, which can generate, modulate and detect photon pulses at the single photon level, is the kernel of QKD.…”
Section: Introductionmentioning
confidence: 99%
“…However, despite the recent results of SQC, several technical challenges still remain, mainly in terms of achievable repetition rate and secret key rate, as well as link stability. In fact, fiber-optics based implementations are still the benchmark for repetition rate [32,33], obtained * paolo.villoresi@dei.unipd.it secure key rate [34,35] and stability [36,37]. On the other hand, recent satellite-based QKD experiments are limited to 100 MHz repetition rate, few kilohertz of secure key rate with Low Earth Orbit (LEO) satellites, 2 ns detection window, and link duration of few minutes [14].…”
Section: Introductionmentioning
confidence: 99%