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在连续变量量子密钥分发的实验系统中, 由于调制器受限于分辨率有限的驱动电压, 理想的高斯调制会退化成离散极化调制, 进而引发系统性能的下降. 本文提出并研究了线性光学克隆机改进的离散极化调制连续变量量子密钥分发方案. 在接收端插入线性光学克隆机能够有效地补偿由幅度和相位离散化产生的综合效应所造成的系统性能损失, 实现整体性能的提升. 本文推导出了所提方案在非理想外差探测下可组合安全密钥率的表达式, 并进行数值仿真. 仿真结果表明, 所提方案不仅能够通过灵活调谐线性光学克隆机的相关参数, 优化安全密钥率、提升过量噪声抗性, 还能有效克服有限码长效应对安全性的影响, 为推动连续变量量子密钥分发的实用化发展提供了切实有效的方法.In experimental setups of continuous-variable quantum key distribution (CVQKD) independently modulating the amplitude and phase of coherent states, the ideal Gaussian modulation will be degraded into discretized polar modulation (DPM) due to the finite resolution of the driving voltages of electro-optical modulators. To compensate for the performance degradation induced by the joint effect of amplitude and phase discretization, linear optics cloning machine (LOCM) can be introduced on the receiver side. Implemented by linear optical elements, heterodyne detection and controlled displacement, LOCM introduces extra noise that can be transformed into an advantageous one to combat channel excess noise by dynamically adjusting the relevant parameters into a suitable range. In this paper, the prepare-and-measure version of LOCM DPM-CVQKD is presented, where the incoming signal state enters a tunable LOCM before being measured by the nonideal heterodyne detector. The equivalent entanglement-based model is also established to perform security analysis, where the LOCM is reformulated into combination of the incoming signal state and a thermal state on a beam splitter. The composable secret key rate is derived to investigate the security of LOCM DPM-CVQKD. Simulation results demonstrate that the composable secret key rate and transmission distance are closely related to the tuning gain and the transmittance of LOCM. Once these two parameters are set to appropriate values, LOCM can improve the secret key rate and transmission distance of DPM-CVQKD, as well as its resistance to excess noise. Meanwhile, taking finite-size effect into consideration, the LOCM can also effectively reduce the requirement for the block size of the exchanged signals, which is beneficial to the feasibility and practicability of CVQKD. Owing to the fact that the performance of LOCM DPM-CVQKD is largely reliant on the calibration selection of relevant parameters, further research may concentrate on the optimization of LOCM in experimental implementations, where machine learning related methods may be utilized.
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Keywords:
- quantum key distribution /
- continuous variable /
- discretized polar modulation /
- linear optics cloning machine
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图 3 LOCM对DPM-CVQKD可组合安全密钥率的改进
Fig. 3. Enhancement of LOCM on the composable secret key rate of DPM-CVQKD.
图 4 LOCM对DPM-CVQKD可容忍过量噪声的改进
Fig. 4. Enhancement of LOCM on the tolerable excess noise of DPM-CVQKD.
图 5 调制方差对最大传输距离的影响, 幅值分辨率和相位分辨率分别设置为${\delta _{\text{a}}} = 0.25$, ${\delta _{\text{p}}} = 0.02$
Fig. 5. The effect of modulation variance on maximum transmission distance, the amplitude resolution and phase resolution are ${\delta _{\text{a}}} = 0.25$, ${\delta _{\text{p}}} = 0.02$, respectively.
图 6 LOCM参数对可组合安全密钥率的影响, 幅值分辨率和相位分辨率分别设置为${\delta _{\text{a}}} = 0.25$, ${\delta _{\text{p}}} = 0.02$
Fig. 6. Effect of LOCM-related parameters on the composable secret key rate, the amplitude resolution and phase resolution are ${\delta _{\text{a}}} = 0.25$, ${\delta _{\text{p}}} = 0.02$, respectively.
图 7 LOCM参数对最大传输距离的影响, 幅值分辨率和相位分辨率分别设置为${\delta _{\text{a}}} = 0.25$, ${\delta _{\text{p}}} = 0.02$ (a)调谐增益$\lambda $与传输损耗的关系; (b)等效透射率$\tau $与传输损耗的关系
Fig. 7. Effect of LOCM parameters on maximum transmission distance, the amplitude resolution and phase resolution are set to ${\delta _{\text{a}}} = 0.25$, ${\delta _{\text{p}}} = 0.02$, respectively: (a) The tuning gain $\lambda $ versus losses; (b) the equivalent transmittance $\tau $ versus losses.
图 8 不同传输距离下码长对可组合安全密钥率的影响, 幅值分辨率和相位分辨率分别设置为${\delta _{\text{a}}} = 0.25$, ${\delta _{\text{p}}} = 0.02$
Fig. 8. Effect of block length on the composable secret key rate under different transmission distances, the amplitude resolution and phase resolution are set to ${\delta _{\text{a}}} = 0.25$, ${\delta _{\text{p}}} = 0.02$, respectively.
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[1] Portmann C, Renner R 2022 Rev. Mod. Phys. 94 025008
Google Scholar
[2] Pirandola S, Andersen U L, Banchi L, Berta M, Bunandar D, Colbeck R, Englund D, Gehring T, Lupo C, Ottaviani C, Pereira J L, Razavi M, Shaari J S, Tomamichel M, Usenko V C, Vallone G, Villoresi P, Wallden P 2020 Adv. Opt. Photonics 12 1012
Google Scholar
[3] Zhang C X, Wu D, Cui P W, Ma J C, Wang Y, An J M 2023 Chin. Phys. B 32 124207
Google Scholar
[4] Zapatero V, Navarrete A, Curty M 2024 Adv. Quantum Technol. 202300380
[5] Diamanti E, Leverrier A 2015 Entropy 17 6072
Google Scholar
[6] Laudenbach F, Pacher C, Fung C H F, Poppe A, Peev M, Schrenk B, Hentschel M, Walther P, Hubel H 2018 Adv. Quantum Technol. 1 1800011
Google Scholar
[7] Guo H, Li Z, Yu S, Zhang Y C 2021 Fundam. Res. 1 96
Google Scholar
[8] Zhang Y C, Bian Y M, Li Z Y, Yu S 2024 Appl. Phys. Rev. 11 011318
Google Scholar
[9] Leverrier A 2015 Phys. Rev. Lett. 114 070501
Google Scholar
[10] Leverrier A 2017 Phys. Rev. Lett. 118 200501
Google Scholar
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Google Scholar
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Google Scholar
[13] Jain N, Chin H M, Mani H, Lupo C, Nikolic D S, Kordts A, Pirandola S, Pedersen T B, Kolb M, Omer B, Pacher C, Gehring T, Andersen U L 2022 Nat. Commun. 13 4740
Google Scholar
[14] Hajomer A A E, Derkach I, Jain N, Chin H M, Andersen U L, Gehring T 2024 Sci. Adv. 10 eadi9474
Google Scholar
[15] Wang T, Huang P, Li L, Zhou Y M, Zeng G H 2024 New J. Phys. 26 023002
Google Scholar
[16] 廖骎, 柳海杰, 王铮, 朱凌瑾 2023 物理学报 72 040301
Google Scholar
Liao Q, Liu H J, Wang Z, Zhu L J 2023 Acta Phys. Sin. 72 040301
Google Scholar
[17] Chen Z Y, Wang X Y, Yu S, Li Z Y, Guo H 2023 npj Quantum Inf. 9 28
Google Scholar
[18] Zheng Y, Wang Y L, Fang C L, Shi H B, Pan W 2024 Phys. Rev. A 109 022424
Google Scholar
[19] 张光伟, 白建东, 颉琦, 靳晶晶, 张永梅, 刘文元 2024 物理学报 73 060301
Google Scholar
Zhang G W, Bai J D, Jie Q, Jin J J, Zhang Y M, Liu W Y 2024 Acta Phys. Sin. 73 060301
Google Scholar
[20] Jouguet P, Kunz-Jacques S, Diamanti E, Leverrier A 2012 Phys. Rev. A 86 032309
Google Scholar
[21] 吴晓东, 黄端, 黄鹏, 郭迎 2022 物理学报 71 240304.
Google Scholar
Wu X D, Huang D, Huang P, Guo Y, 2022 Acta Phys. Sin. 71 240304
Google Scholar
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[23] Lupo C 2020 Phys. Rev. A 102 022623
Google Scholar
[24] Wang T Y, Li M, Wang X 2022 Opt. Express 30 36122
Google Scholar
[25] Wang T Y, Li M, Wang X, Hou L 2023 Opt. Express 31 21014
Google Scholar
[26] Guo Y, Lv G, Zeng G H 2015 Quantum Inf. Process. 14 4323
Google Scholar
[27] Wu X D, Liao Q, Huang D, Wu X H, Guo Y 2017 Chin. Phys. B 26 110304
Google Scholar
[28] Zhang H, Mao Y, Huang D, Guo Y, Wu X D, Zhang L 2018 Chin. Phys. B 27 090307
Google Scholar
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Google Scholar
[30] He Y, Wang T Y 2024 Quantum Inf Process. 23 135
Google Scholar
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Google Scholar
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Google Scholar
[32] 吴晓东, 黄端 2023 物理学报 72 050303
Google Scholar
Wu X D, Huang D 2023 Acta Phys. Sin. 72 050303
Google Scholar
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Google Scholar
[34] Pirandola S 2021 Phys. Rev. Res. 3 043014
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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