Integration of Quantum Key Distribution in Metropolitan Area Networks

Poppe, Andreas; Schrenk, Bernhard; Hipp, Florian; Peev, Momtchil; Aleksić, Slaviša; Franzl, Gerald; Ciurana, Alex; Martín, Vicente

doi:10.1364/qim.2014.qw4a.6

Cited by 6 publications

(4 citation statements)

References 6 publications

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“…Second, QKD systems are extremely sensitive to losses and noise. Strong conventional signals may constitute severe impairments on the weak quantum signals [6], as identified and analyzed in [11,12,15,17,18].…”

Section: Challenges Of the Coexistence Approachmentioning

confidence: 99%

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Perspectives and limitations of QKD integration in metropolitan area networks

et al. 2015

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Quantum key distribution (QKD) systems have already reached a reasonable level of maturity. However, a smooth integration and a wide adoption of commercial QKD systems in metropolitan area networks has still remained challenging because of technical and economical obstacles. Mainly the need for dedicated fibers and the strong dependence of the secret key rate on both loss budget and background noise in the quantum channel hinder a practical, flexible and robust implementation of QKD in current and next-generation optical metro networks. In this paper, we discuss these obstacles and present approaches to share existing fiber infrastructures among quantum and classical channels. Particularly, a proposal for a smooth integration of QKD in optical metro networks, which implies removing spurious background photons caused by optical transmitters, amplifiers and nonlinear effects in fibers, is presented and discussed. We determine and characterize impairments on quantum channels caused by many classical telecom channels at practically used power levels coexisting within the same fiber. Extensive experimental results are presented and indicate that a practical integration of QKD in conventional optical metro networks is possible.

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Section: Challenges Of the Coexistence Approachmentioning

confidence: 99%

“…Such an option, referred to as coexistence scheme, has attracted particular interest in recent years. Several studies show that the coexistence scheme is in principle possible [4][5][6][7][8][9][10][11][12][13][14][15], but the introduced impairments strongly limit the performance of the QKD system. As can be seen from Fig.…”

Section: Introductionmentioning

confidence: 99%

Perspectives and limitations of QKD integration in metropolitan area networks

et al. 2015

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“…A number of QKD protocols with proven security [4][5][6] have been considered, which can be categorized as either "prepare-and-measure" schemes or entanglement based protocols. In practical implementations, qubits can be encoded into single photons (or approximations thereof) through their polarization or arrival times, and are transmitted between two parties either over free space to establish long distance links [7][8][9][10], or through optical fibres for medium distance applications [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Fibre polarization state compensation in entanglement-based quantum key distribution

Shi,

Poh,

Ling

et al. 2021

Preprint

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Quantum Key Distribution (QKD) using polarisation encoding can be hard to implement over deployed telecom fibres because the routing geometry and the birefringence of the fibre link can alter the polarisation states of the propagating photons. These alterations cause a basis mismatch, leading to an increased Quantum Bit Error Rate (QBER). In this work we demonstrate a technique for dynamically compensating fibre-induced state alteration in a QKD system over deployed fibre. This compensation scheme includes a feedback loop that minimizes the QBER using a stochastic optimization algorithm.

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“…Fiber-based QKD generally operates over shorter range (<100 km) due to optical attenua) Electronic mail: cqtsy@nus.edu.sg b) Electronic mail: phyck@nus.edu.sg ation of light in the fiber. This is, however, enough to cover metropolitan areas where a fiber network is available [18][19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

Stable Polarization Entanglement based Quantum Key Distribution over Metropolitan Fibre Network

Shi,

Thar,

Poh

et al. 2020

Preprint

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We demonstrate a quantum key distribution implementation over deployed dark telecom fibers with polarisationentangled photons generated at the O-band. One of the photons in the pairs are propagated through 10 km of deployed fiber while the others are detected locally. Polarisation drifts experienced by the photons propagating through the fibers are compensated with liquid crystal variable retarders. This ensures continuous and stable QKD operation with an average QBER of 6.4% and a final key rate of 109 bits/s.

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Integration of Quantum Key Distribution in Metropolitan Area Networks

Abstract: Abstract:The deployment of Quantum Key Distribution forces the development of QKD-links to be operated in current and next-generation photonic metro-access networks. These highly heterogeneous architectures determine the conditions QKD-links need to be optimized for.

Cited by 6 publications

References 6 publications

Perspectives and limitations of QKD integration in metropolitan area networks

Perspectives and limitations of QKD integration in metropolitan area networks

Fibre polarization state compensation in entanglement-based quantum key distribution

Stable Polarization Entanglement based Quantum Key Distribution over Metropolitan Fibre Network

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