Phase compensation for free-space continuous-variable quantum key distribution

Wang, Shiyu; Huang, Peng; Liu, Miaomiao; Wang, Tao; Wang, Ping; Zeng, Guihua

doi:10.1364/oe.387402

Cited by 13 publications

(6 citation statements)

References 26 publications

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“…For the orthogonal field phase used for information encoding, atmospheric turbulence will also cause disturbance, which will also introduce an additional noise [ 43 ]. Fortunately, an existing study has shown that this phase disturbance can be eliminated by phase compensation [ 44 ]. Therefore, we mainly consider the noise introduced by mode crosstalk.…”

Section: Performance Analysismentioning

confidence: 99%

High-Rate Continuous-Variable Quantum Key Distribution with Orbital Angular Momentum Multiplexing

Ruan

Shi

Chen

et al. 2021

Entropy

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The secret key rate is one of the main obstacles to the practical application of continuous-variable quantum key distribution (CVQKD). In this paper, we propose a multiplexing scheme to increase the secret key rate of the CVQKD system with orbital angular momentum (OAM). The propagation characteristics of a typical vortex beam, involving the Laguerre–Gaussian (LG) beam, are analyzed in an atmospheric channel for the Kolmogorov turbulence model. Discrete modulation is utilized to extend the maximal transmission distance. We show the effect of the transmittance of the beam over the turbulent channel on the secret key rate and the transmission distance. Numerical simulations indicate that the OAM multiplexing scheme can improve the performance of the CVQKD system and hence has potential use for practical high-rate quantum communications.

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Section: Performance Analysismentioning

confidence: 99%

High-Rate Continuous-Variable Quantum Key Distribution with Orbital Angular Momentum Multiplexing

Ruan

Shi

Chen

et al. 2021

Entropy

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“…Satellite-to-ground QKD and a quantumsecured video conference between Beijing and Vienna were carried out with the "Micius" satellite in 2017 [12][13][14] . These groundbreaking results have spurred an international enthu-siasm for applications of space-based quantum communications [15][16][17][18][19][20][21][22] .…”

Section: Introductionmentioning

confidence: 99%

Portable ground stations for space-to-ground quantum key distribution

Ren¹,

Abulizi²,

Yong³

et al. 2022

Preprint

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Quantum key distribution (QKD) uses the fundamental principles of quantum mechanics to share unconditionally secure keys between distant users. Previous works based on the quantum science satellite "Micius" have initially demonstrated the feasibility of a global QKD network. However, the practical applications of space-based QKD still face many technical problems, such as the huge size and weight of ground stations required to receive quantum signals. Here, we report space-to-ground QKD demonstrations based on portable receiving ground stations. The weight of the portable ground station is less than 100 kg, the space required is less than 1 m 3 and the installation time requires no more than 12 hours, all of the weight, required space and deployment time are about two orders of magnitude lower than those for the previous systems. Moreover, the equipment is easy to handle and can be placed on the roof of buildings in a metropolis. Secure keys have been successfully generated from the "Micius" satellite to these portable ground stations at six different places in China, and an average final secure key length is around 50 kb can be obtained during one passage. Our results pave the way for, and greatly accelerate the practical application of, space-based QKD.

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“…In free-space, the channel fading [24][25][26], whose transmissivity changes because of air turbulence, makes the problem more complex [27][28][29][30][31]. The analysis of the channel fading is a core problem of any free-space CV-QKD protocol that does not depend on fiber facilities, especially the long-distance QKD implementations via a satellite [32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Free-Space Continuous-Variable Quantum Key Distribution with Imperfect Detector against Uniform Fast-Fading Channels

et al. 2022

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Free-space continuous-variable quantum key distribution based on atmospheric laser communications is expected to play an important role in the global continuous-variable quantum key distribution network. The practical homodyne detector model is applied in free-space continuous-variable quantum key distribution which models the imperfect characteristics including the detection efficiency and the electronic noise. In the conventional model, we must calibrate them simultaneously. In the modified model, only one of the imperfections needs to be calibrated to simplify the calibration process of the practical experiments, also known as one-time calibration. The feasibility of the modified detector model against the fast-fading channel is proved. The results of the symmetry operations are considered when presenting detailed security analysis. Some remarkable features of the uniform fast-fading channel were found from the simulation results. The performances of the conventional model and the modified model are similar but the modified model has the advantage of achieving one-time calibration.

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Phase compensation for free-space continuous-variable quantum key distribution

Cited by 13 publications

References 26 publications

High-Rate Continuous-Variable Quantum Key Distribution with Orbital Angular Momentum Multiplexing

High-Rate Continuous-Variable Quantum Key Distribution with Orbital Angular Momentum Multiplexing

Portable ground stations for space-to-ground quantum key distribution

Free-Space Continuous-Variable Quantum Key Distribution with Imperfect Detector against Uniform Fast-Fading Channels

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