A modified practical homodyne detector model for continuous-variable quantum key distribution: detailed security analysis and improvement by the phase-sensitive amplifier

Huang, Yundi; Zhang, Yichen; Xu, Bingjie; Huang, Luyu; Yu, Song

doi:10.1088/1361-6455/abc7fd

Cited by 10 publications

(7 citation statements)

References 36 publications

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“…where both xv 1 and xv 2 have a variance of 1. In the modified detector model, a new SNU which is not the same as the conventional detector model is defined as [37,[40][41][42], where V ele represents the variance of X ele , so the output normalized by the new SNU is given by…”

Section: Imperfections and Trusted Model Of The Practical Homodyne De...mentioning

confidence: 99%

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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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Section: Imperfections and Trusted Model Of The Practical Homodyne De...mentioning

confidence: 99%

“…In terms of the second part of Equation ( 9), The electronic noise will not be calibrated within the PM model so that the mode D is unknown to us [40]. Equation ( 12) will be rewritten as…”

Section: The Secret Key Rate Of Modified Detector Model Against Fast-...mentioning

confidence: 99%

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

et al. 2022

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“…In this section, we show the performance of the downstream access network by applying the security analysis that we proved in Section III. The one-time-calibration model [41,42] is applied in the secret key rate calculation, since it can model the practical imperfections of the homodyne detector and is more applicable in practical implementations, detailed secret key rate calculation is provided in the Appendix.…”

Section: Performance Analysismentioning

confidence: 99%

“…The secret key rate is calculated by following the proposed security analysis for the downstream access network in Section III, and the one-time calibration model [41,42] which is designed for modelling the imperfections of practical homodyne detector. Again, the coherent state and homodyne detection scheme is taken as an example in the calculation.…”

Section: Appendix: Secret Key Rate Calculationmentioning

confidence: 99%

Realizing downstream access network using continuous-variable quantum key distribution

Huang¹,

Shen²,

Wang³

et al. 2021

Preprint

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Quantum key distribution (QKD) which enables the secure distribution of symmetric keys between two legitimate parties is of great importance in future network security. Access network that connects multiple end-users with one network backbone can be combined with QKD to build security for end-users in a scalable and cost-effective way. Though previous QKD access networks are all implemented in the upstream direction, in this paper, we prove that downstream access network can also be constructed by using continuous-variable (CV) QKD. The security of the CV-QKD downstream access network is analyzed in detail, where we show the security analysis is secure against other parties in the network. The security analysis we proved corresponds to the downstream access network where only passive beamsplitter is sufficient to distribute the quantum signals and no other active controls are demanded. Moreover, standard CV-QKD systems can be directly fitted in the downstream access network, which makes it more applicable for practical implementations. Numerous simulation results are provided to demonstrate the performance of the CV-QKD downstream access network, where up to 64 end-users are shown to be feasible to access the network. Our work provides the security analysis framework for realizing QKD in the downstream access network which will boost the diversity for constructing practical QKD networks.

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“…However, the deviation between the theoretical assumption and the actual implementation will effect the performance and may lead to a loophole in the practical system that could be used by Eve to intercept key information without being discovered. The loopholes involve the the laser source [ 23 , 24 , 25 ], the local oscillator [ 26 , 27 ], the beam splitter (BS) [ 28 , 29 , 30 ], the basis choice [ 31 ], and the detector [ 32 , 33 , 34 , 35 , 36 , 37 ]. Nowadays, researchers have proposed the CV-MDI-QKD protocol [ 38 , 39 , 40 ], which can defend all detector side channels.…”

Section: Introductionmentioning

confidence: 99%

Improving the Performance of Continuous-Variable Measurement-Device-Independent Quantum Key Distribution via a Noiseless Linear Amplifier

Jing

Liu

Kong

2021

Entropy

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In the continuous variable measurement-device-independent quantum key distribution (CV-MDI-QKD) protocol, both Alice and Bob send quantum states to an untrusted third party, Charlie, for detection through the quantum channel. In this paper, we mainly study the performance of the CV-MDI-QKD system using the noiseless linear amplifier (NLA). The NLA is added to the output of the detector at Charlie’s side. The research results show that NLA can increase the communication distance and secret key rate of the CV-MDI-QKD protocol. Moreover, we find that the more powerful the improvement of the performance with the longer gain of NLA and the optimum gain is given under different conditions.

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A modified practical homodyne detector model for continuous-variable quantum key distribution: detailed security analysis and improvement by the phase-sensitive amplifier

Cited by 10 publications

References 36 publications

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

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

Realizing downstream access network using continuous-variable quantum key distribution

Improving the Performance of Continuous-Variable Measurement-Device-Independent Quantum Key Distribution via a Noiseless Linear Amplifier

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