Security proof for a simplified Bennett-Brassard 1984 quantum-key-distribution protocol

Rusca, Davide; Boaron, Alberto; Curty, Marcos; Martin, Anthony; Zbinden, Hugo

doi:10.1103/physreva.98.052336

Cited by 48 publications

(37 citation statements)

References 33 publications

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“…We chose this specific block size as it corresponds to the overall detection events in the computational basis over a period of 30 seconds, meaning that the acquisition time of our block is exactly 30 seconds. Note that the secret key rate per core shown in Figure 4 a) is obtained only from each core raw key through finite key analysis [34,35,37], meaning that error correction and privacy amplification effects are taken into account but not actually implemented and that the obtained key rates also consider fluctuations given by the finite statistics. These rates show an average of 2.86 Mbit s −1 ± 4.37 kbit s −1 leading to a total multiplexed rate of 105.7 Mbit s −1 .…”

Section: Resultsmentioning

confidence: 99%

Boosting the secret key rate in a shared quantum and classical fibre communication system

et al. 2019

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During the last 20 years, the advance of communication technologies has generated multiple exciting applications. However, classical cryptography, commonly adopted to secure current communication systems, can be jeopardized by the advent of quantum computers. Quantum key distribution (QKD) is a promising technology aiming to solve such a security problem. Unfortunately, current implementations of QKD systems show relatively low key rates, demand low channel noise and use ad hoc devices. In this work, we picture how to overcome the rate limitation by using a 37-core fibre to generate 2.86 Mbit s −1 per core that can be space multiplexed into the highest secret key rate of 105.7 Mbit s −1 to date. We also demonstrate, with off-the-shelf equipment, the robustness of the system by co-propagating a classical signal at 370 Gbit s −1 , paving the way for a shared quantum and classical communication network. * dabac@fotonik.dtu.dk, bdali@fotonik.dtu.dk These authors contributed equally to this work 1 arXiv:1911.05360v1 [quant-ph] 13 Nov 2019 of integration with the bright signals used in classical communications [17][18][19][20][21][22][23]. In this work, we show how to overcome the low rate and compatibility limitations by exploiting a 37-core multicore fibre (MCF) as a technology for quantum communications [24]. This technology allows for efficient key generation, enabling the highest secret key rate presented to date. Moreover, we co-propagate in all the 37 cores simultaneously a high-speed classical signal, showing that the quantum communication is only weakly perturbed by it, paving the way for a full-fleshed implementation in current communication infrastructures.

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Section: Resultsmentioning

confidence: 99%

Boosting the secret key rate in a shared quantum and classical fibre communication system

et al. 2019

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“…In Fig. 4 we present the in-field performances of our QKD scheme in terms of quantum bit error rate (QBER) achieved in both measurement bases and final secret key rate (SKR) evaluated with a finite-key analysis [24]. We started testing states exchange with the fiber completely dark, i.e.…”

Section: Resultsmentioning

confidence: 99%

“…Laser Q: continuous wave laser at 1560.61 nm; Laser C: continuous wave laser at 1536.61 nm; IM: intensity modulator; PM: phase modulator; BS: beam splitter; VOA: variable optical attenuator; DWDM: dense wavelength division multiplexing filter; DLI: delay-line interferemoter; SPAD: single-photon avalanche detector; APD: avalanche photodiode. In the green square we reported the three quantum states prepared by Alice and propagated through the channel (WCPs) are prepared instead of single photons, a very efficient one-decoy state scheme can be implemented in order to detect photon number splitting attacks [24][25][26]. The SKR length ( ) per privacy amplification block is given by the following formula:…”

Section: Protocolmentioning

confidence: 99%

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Field trial of a three-state quantum key distribution scheme in the Florence metropolitan area

Bacco

Vagniluca

Lio

et al. 2019

EPJ Quantum Technol.

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In-field demonstrations in real-world scenarios boost the development of a rising technology towards its integration in existing infrastructures. Although quantum key distribution (QKD) devices are already adopted outside the laboratories, current field implementations still suffer from high costs and low performances, preventing this emerging technology from a large-scale deployment in telecommunication networks. Here we present a simple, practical and efficient QKD scheme with finite-key analysis, performed over a 21 dB-losses fiber link installed in the metropolitan area of Florence (Italy). Coexistence of quantum and weak classical communication is also demonstrated by transmitting an optical synchronization signal through the same fiber link.

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“…The error correction was performed with a Cascade algorithm [20], with an efficiency of 1.05. The compression factor was calculated over a privacy amplification block of 8 • 10 6 bits and taking into account finitekey effects [21].…”

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confidence: 99%

The limits of multiplexing quantum and classical channels: Case study of a 2.5 GHz discrete variable quantum key distribution system

Grünenfelder,

Sax,

Boaron

et al. 2021

Preprint

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Network integration of quantum key distribution is crucial for its future widespread deployment due to the high cost of using optical fibers dedicated for the quantum channel, only. We studied the performance of a system running a simplified BB84 protocol at 2.5 GHz repetition rate, operating in the original wavelength band, short O-band, when multiplexed with communication channels in the conventional wavelength band, short C-band. Our system could successfully generate secret keys over a single-mode fiber with a length of 95.5 km and with co-propagating classical signals at a launch power of 8.9 dBm. Further, we discuss the performance of an ideal system under the same conditions, showing the limits of what is possible with a discrete variable system in the O-band. We also considered a short and lossy link with 51 km optical fiber resembling a real link in a metropolitan area network. In this scenario we could exchange a secret key with a launch power up to 16.7 dBm in the classical channels.

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Security proof for a simplified Bennett-Brassard 1984 quantum-key-distribution protocol

Cited by 48 publications

References 33 publications

Boosting the secret key rate in a shared quantum and classical fibre communication system

Boosting the secret key rate in a shared quantum and classical fibre communication system

Field trial of a three-state quantum key distribution scheme in the Florence metropolitan area

The limits of multiplexing quantum and classical channels: Case study of a 2.5 GHz discrete variable quantum key distribution system

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