Field demonstration of a continuous-variable quantum key distribution network

Huang, Duan; Huang, Peng; Li, Huasheng; Wang, Tao; Zhou, Yonghui; Zeng, Guihua

doi:10.1364/ol.41.003511

Cited by 125 publications

(65 citation statements)

References 19 publications

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“…More recently, demonstrations based on continuous-variable quantum teleportation and continuousvariable Einstein-Podolsky-Rosen entangled states under labortory environment have been reported [28,29]. The longest field tests of a CV-QKD system have been achieved over a 17.52 km deployed fiber (10.25 dB loss) [35] and a 17.7 km deployed fiber (5.6 dB loss) [36], where the secure key rates were 0.2 kbps and 0.3 kbps, respectively. Compared with field tests for discrete-variable QKD systems [30,31,32,33,34], these demonstrations have limited transmission distances and low key rates.…”

Section: Introductionmentioning

confidence: 99%

Continuous-variable QKD over 50 km commercial fiber

Zhang

Chen

et al. 2019

Quantum Sci. Technol.

182

104

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The continuous-variable version of quantum key distribution (QKD) offers the advantages (over discrete-variable systems) of higher secret key rates in metropolitan areas, as well as the use of standard telecom components that can operate at room temperature. An important step in the real-world adoption of continuous-variable QKD is the deployment of field tests over commercial fibers. Here we report two different field tests of a continuousvariable QKD system through commercial fiber networks in Xi'an and Guangzhou over distances of 30.02 km (12.48 dB) and 49.85 km (11.62 dB), respectively. We achieve secure key rates two orders-of-magnitude higher than previous field test demonstrations by employing an efficient calibration model with one-time evaluation. This accomplishment is also realized by developing a fully automatic control system which stabilizes system noise, and by applying a rate-adaptive reconciliation method which maintains high reconciliation efficiency with high success probability in fluctuated environments. Our results pave the way to deploy continuousvariable QKD in metropolitan settings.

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Section: Introductionmentioning

confidence: 99%

Continuous-variable QKD over 50 km commercial fiber

Zhang

Chen

et al. 2019

Quantum Sci. Technol.

182

104

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“…The quest for long distance and high bit-rate quantum encrypted transmission using optical fibers [9] has led researchers to investigate a range of methods [10,11]. Two standard techniques have been implemented for encrypted transmission over standard single mode fiber (SSMF), that is, DV-QKD [12,13] and CV-QKD [14][15][16]. DV-QKD protocols, such as BB84 or coherent one-way (COW) [17], involve the generation and detection of very weak optical signals, ideally at single photon level.…”

Section: Introductionmentioning

confidence: 99%

Quantum-to-the-Home: Achieving Gbits/s Secure Key Rates via Commercial Off-the-Shelf Telecommunication Equipment

Asif

Buchanan

2017

Security and Communication Networks

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There is current significant interest in Fiber-to-the-Home (FTTH) networks, that is, end-to-end optical connectivity. Currently, it may be limited due to the presence of last-mile copper wire connections. However, in near future, it is envisaged that FTTH connections will exist, and a key offering would be the possibility of optical encryption that can best be implemented using Quantum Key Distribution (QKD). However, it is very important that the QKD infrastructure is compatible with the already existing networks for a smooth transition and integration with the classical data traffic. In this paper, we report the feasibility of using off-the-shelf telecommunication components to enable high performance Continuous Variable-Quantum Key Distribution (CV-QKD) systems that can yield secure key rates in the range of 100 Mbits/s under practical operating conditions. Multilevel phase modulated signals ( -PSK) are evaluated in terms of secure key rates and transmission distances. The traditional receiver is discussed, aided by the phase noise cancellation based digital signal processing module for detecting the complex quantum signals. Furthermore, we have discussed the compatibility of multiplexers and demultiplexers for wavelength division multiplexed Quantum-to-the-Home (QTTH) network and the impact of splitting ratio is analyzed. The results are thoroughly compared with the commercially available high-cost encryption modules.

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“…What's more, its composable security has been fully proven [14]. Furthermore, this protocol has been experimentally proved to be feasible both in laboratory [7,15] and field tests [16]. A recent demonstration of all-fiber Gaussian-modulated CVQKD protocol has extended the secure transmission distance of CVQKD over 100 km in the laboratory [17], which showing its potential of being an appealing solution for metropolitan quantum networks.…”

Section: Introductionmentioning

confidence: 99%

Long-distance continuous-variable measurement-device-independent quantum key distribution with discrete modulation

Huang

Bai

et al. 2019

Phys. Rev. A

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We propose a long-distance continuous-variable measurement-device-independent quantum key distribution (CV-MDI-QKD) protocol with discrete modulation. This kind of discrete-modulated schemes have good compatibility with efficient error correction code, which lead to higher reconciliation efficiency even at low signalto-noise ratio (SNR). Security analysis shows that the proposed protocol is secure against arbitrary collective attacks in the asymptotic limit with proper use of decoy states. And with the using of discrete modulation, the proposed CV-MDI-QKD protocol has simpler implementation and outperform previous protocols in terms of achievable maximal transmission distance, which precisely solve the bottleneck of the original Gaussianmodulated CV-MDI-QKD protocol.

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Field demonstration of a continuous-variable quantum key distribution network

Cited by 125 publications

References 19 publications

Continuous-variable QKD over 50 km commercial fiber

Continuous-variable QKD over 50 km commercial fiber

Quantum-to-the-Home: Achieving Gbits/s Secure Key Rates via Commercial Off-the-Shelf Telecommunication Equipment

Long-distance continuous-variable measurement-device-independent quantum key distribution with discrete modulation

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