Demonstration of a quantum key distribution network in urban fibre-optic communication lines

Kiktenko, Evgeniy O.; Pozhar, N.O.; Duplinskiy, Alexander; Kanapin, A.; Соколов, А. И.; Vorobey, S. S.; Miller, A. V.; Ustimchik, V.; Anufriev, M.N.; Трушечкин, А. С.; Yunusov, R. R.; Kurochkin, V. L.; Kurochkin, Y. V.; Fedorov, Aleksey K.

doi:10.1070/qel16469

Cited by 35 publications

(28 citation statements)

References 18 publications

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“…The average QBER in our work is 2% with a sifted key rate of 0.5 Kbit/s. Furthermore, the system has been tested as a part of an urban QKD network [26]. Experimental demonstration confirms the suitability of the setup for practical applications.…”

Section: Introductionmentioning

confidence: 58%

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Low loss QKD optical scheme for fast polarization encoding

Duplinskiy¹,

Ustimchik²,

Kanapin³

et al. 2017

Opt. Express

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Abstract:We present a new optical scheme for BB84 protocol quantum key distribution (QKD). The proposed setup consists of a compact all-fiber polarization encoding optical scheme based on LiNbO 3 phase modulators, single laser source and two single-photon detectors. Optical scheme consists of standard telecommunication components and is suitable for both fiber and free-space quantum communication channels. Low losses (~2dB) in Bob's device increase both the key generation rate and distance limit. A new technique for solving polarization mode dispersion (PMD) issue in LiNbO 3 is implemented, allowing two crystals to neutralize the effect of each other. Several proofof-concept experiments have been conducted at 10 MHz repetition frequency over 50 km of standard optical fiber under laboratory conditions and over 30 km of urban fiber with high losses (13dB), which is a link within a QKD network. To achieve this, calibration algorithms have been developed, allowing the system to work autonomously and making it promising for practical applications.

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Section: Introductionmentioning

confidence: 58%

“…The system is currently used as a link within a QKD network across the urban fiber channels [26]. The developed QKD network is based on the trusted repeater paradigm and allows establishing a common key between users over an intermediate trustworthy node.…”

Section: Resultsmentioning

confidence: 99%

Low loss QKD optical scheme for fast polarization encoding

Duplinskiy¹,

Ustimchik²,

Kanapin³

et al. 2017

Opt. Express

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show abstract

“…The basis for our experimental work is our recently developed modular QKD device [32,[47][48][49][50] driven by a National Instruments NI PCIe-7811R card. This setup uses a semiconductor laser LDI-DFB2.5G controlled by an FPGA board Spartan-6 to generate optical pulses at the standard telecommunication wavelength 1.55 µm and a 10 MHz repetition rate.…”

Section: Appendix D Qkd Networkmentioning

confidence: 99%

Quantum-secured blockchain

Kiktenko

Pozhar

Anufriev

et al. 2018

Quantum Sci. Technol.

Self Cite

209

143

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Blockchain is a distributed database which is cryptographically protected against malicious modifications. While promising for a wide range of applications, current blockchain platforms rely on digital signatures, which are vulnerable to attacks by means of quantum computers. The same, albeit to a lesser extent, applies to cryptographic hash functions that are used in preparing new blocks, so parties with access to quantum computation would have unfair advantage in procuring mining rewards. Here we propose a possible solution to the quantum-era blockchain challenge and report an experimental realization of a quantum-safe blockchain platform that utilizes quantum key distribution across an urban fiber network for information-theoretically secure authentication. These results address important questions about realizability and scalability of quantum-safe blockchains for commercial and governmental applications.

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“…In particular, in urban fibers lines, the effect of crosstalk on QBER can become significant [37]. We also tested the setup for establishing a link in a heterogeneous quantum network in Moscow [38].…”

Section: Plug-and-play Qkd Scheme: Bb84mentioning

confidence: 99%

Modular Quantum Key Distribution Setup for Research and Development Applications

et al. 2019

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Quantum key distribution (QKD), ensuring the unconditional security of information, attracts a significant deal of interest. An important task is to design QKD systems as a platform for education as well as for research and development applications and fast prototyping new QKD protocols. Here we present a modular QKD setup driven by National Instruments (NI) cards with open source LabView code, open source Python code for post-processing procedures, and open source protocol for external applications. An important feature of the developed apparatus is its flexibility offering possibilities to modify optical schemes and verify novel QKD protocols. Another distinctive feature of the developed setup is the implementation of the decoy-state protocol, which is a standard tool for secure long-distance quantum communications. By testing the plug-and-play scheme realizing BB84 and decoy-state BB84 QKD protocols, we demonstrate that developed QKD setup shows a high degree of robustness beyond laboratory conditions. We demonstrate the results of the use of the developed modular setup for urban QKD experiments.

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Demonstration of a quantum key distribution network in urban fibre-optic communication lines

Cited by 35 publications

References 18 publications

Low loss QKD optical scheme for fast polarization encoding

Low loss QKD optical scheme for fast polarization encoding

Quantum-secured blockchain

Modular Quantum Key Distribution Setup for Research and Development Applications

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