High-dimensional decoy-state quantum key distribution over multicore telecommunication fibers

Cañas, Gustavo; Vera, Nicolas; Cariñe, Jaime; González, P.; Cárdenas, Jaime; Connolly, Peter W. R.; Przysiezna, A.; Gómez, Esteban S.; Figueroa, Miguel; Vallone, Giuseppe; Villoresi, Paolo; Silva, T. Ferreira da; Xavier, G. B.; Lima, G.

doi:10.1103/physreva.96.022317

Cited by 124 publications

(105 citation statements)

References 51 publications

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“…As an example, high-speed classical communication at 10.16 Pbit s −1 has been demonstrated thanks to SDM combined with dense wavelength division multiplexing, polarization modulation and advanced coding [29]. Likewise, both multicore and few-mode fibres have been exploited for encoding and transmitting high-dimensional (Hi-D) quantum states [30][31][32].In particular, the cores or the modes of these special fibres have been used to increase the dimensionality of the Hilbert space, thus allowing higher photon information efficiency. Although Hi-D quantum states are suitable for high rate quantum communications, in specific channel conditions (low noise channel), it was experimentally demonstrated that SDM is suitable for very high rate secure communications [33].…”

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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“…Multicore fibers -Multicore fibers present wellperformant characteristics: they offer low losses (comparable with the standard single-mode fibers) and low cross-talk between cores (fundamental for reliable transmission of the qudits) [161]. Previous experiments already demonstrated the capability of transferring spatial modes of light with high-fidelity up to a dimension equal to four [162][163][164]. In particular, Y. Ding and coauthors used two silicon photonic platforms, connected by a 3 m MCF, for preparing and measuring the quantum states [162], as reported in Figure 8.…”

Section: Fiber-based Linksmentioning

confidence: 99%

High‐Dimensional Quantum Communication: Benefits, Progress, and Future Challenges

et al. 2019

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In recent years, there has been a rising interest in high‐dimensional quantum states and their impact on quantum communication. Indeed, the availability of an enlarged Hilbert space offers multiple advantages, from larger information capacity and increased noise resilience, to novel fundamental research possibilities in quantum physics. Multiple photonic degrees of freedom have been explored to generate high‐dimensional quantum states, both with bulk optics and integrated photonics. Furthermore, these quantum states have been propagated through various channels, for example, free‐space links, single‐mode, multicore, and multimode fibers, and also aquatic channels, experimentally demonstrating the theoretical advantages over 2D systems. Here, the state‐of‐the‐art on the generation, propagation, and detection of high‐dimensional quantum states is reviewed. Quantum communication with states living in d‐dimensional Hilbert spaces, qudits, yields great benefits. However, qudits generation, transmission, and detection is not a simple task to accomplish. This review presents the state‐of‐the‐art on the generation, propagation, and measurement of high‐dimensional quantum states, highlighting their advantages, issues, and future perspectives.

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“…loop phase stabilization system can be implemented for a longer transmission distance, as reported in. 35 In order to avoid influence by polarization drift, two different strategies can be used. Firstly, a two dimensional grating coupler associated with an MZI 36 can be used to couple with the cores of the MCF, so that the polarization for each core can be tuned independently.…”

Section: Discussionmentioning

confidence: 99%

High-dimensional quantum key distribution based on multicore fiber using silicon photonic integrated circuits

et al. 2017

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Quantum key distribution provides an efficient means to exchange information in an unconditionally secure way. Historically, quantum key distribution protocols have been based on binary signal formats, such as two polarization states, and the transmitted information efficiency of the quantum key is intrinsically limited to 1 bit/photon. Here we propose and experimentally demonstrate, for the first time, a high-dimensional quantum key distribution protocol based on space division multiplexing in multicore fiber using silicon photonic integrated lightwave circuits. We successfully realized three mutually unbiased bases in a four-dimensional Hilbert space, and achieved low and stable quantum bit error rate well below both the coherent attack and individual attack limits. Compared to previous demonstrations, the use of a multicore fiber in our protocol provides a much more efficient way to create high-dimensional quantum states, and enables breaking the information efficiency limit of traditional quantum key distribution protocols. In addition, the silicon photonic circuits used in our work integrate variable optical attenuators, highly efficient multicore fiber couplers, and Mach-Zehnder interferometers, enabling manipulating high-dimensional quantum states in a compact and stable manner. Our demonstration paves the way to utilize state-of-the-art multicore fibers for noise tolerance high-dimensional quantum key distribution, and boost silicon photonics for high information efficiency quantum communications.npj Quantum Information (2017) 3:25 ; doi:10.1038/s41534-017-0026-2 INTRODUCTION Quantum key distribution (QKD) is an attractive quantum technology that provides a means to securely share secret keys between two clients (Alice and Bob).1-4 Traditional QKD is based on binary signal formats, such as the BB84 protocol where the quantum information is encoded in the polarization domain.5 Four polarization states create a set of two mutually unbiased basis (MUBs) in a two-dimensional Hilbert space which are used for establishing quantum keys between two parties. In these binary QKD systems the information efficiency is limited to 1 bit/photon. Recently, tremendous efforts have been put into developing novel protocols to increase the information efficiency.6-10 Highdimensional QKD (HD-QKD) based on qudit encoding (unit of information in a N dimension space) is an efficient technique to achieve high information efficiency for QKD systems.

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High-dimensional decoy-state quantum key distribution over multicore telecommunication fibers

Cited by 124 publications

References 51 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

High‐Dimensional Quantum Communication: Benefits, Progress, and Future Challenges

High-dimensional quantum key distribution based on multicore fiber using silicon photonic integrated circuits

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