Experimental Demonstration of LLO Continuous-Variable Quantum Key Distribution With Polarization Loss Compensation
The compensation process for the state of polarization (SOP) from quantum signal plays an important role in the practical implementation of continuous-variable quantum key distribution (CV-QKD). In contrast to the previous scheme using an expensive digital dynamic polarization controller, we choose...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IEEE
2023-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/10049095/ |
| _version_ | 1811162832815783936 |
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| author | Tao Shen Xiangyu Wang Ziyang Chen Huiping Tian Song Yu Hong Guo |
| author_facet | Tao Shen Xiangyu Wang Ziyang Chen Huiping Tian Song Yu Hong Guo |
| author_sort | Tao Shen |
| collection | DOAJ |
| description | The compensation process for the state of polarization (SOP) from quantum signal plays an important role in the practical implementation of continuous-variable quantum key distribution (CV-QKD). In contrast to the previous scheme using an expensive digital dynamic polarization controller, we choose a cheaper manual polarization controller interfaced with a digital algorithm based on Kalman filter to achieve compensation of the polarization loss under the condition that the SOP of the fiber is relatively stable. This paper also enumerates the details of other digital signal processing method to achieve final secret key rate. And a pilot-sequential Gaussian modulated coherent state (GMCS) continuous-variable quantum key distribution system with a local local oscillator (LLO) is experimentally implemented based on the analysis of excess noise. Finally, the experimental results show that the method of polarization loss compensation takes advantages in maintaining the stability of the final secret key rate. And a secret key rate of 110 kbps is achieved within 20 km optical fiber (with 4 dB loss) under the finite-size block of <inline-formula><tex-math notation="LaTeX">$1 \times {10^{6}}$</tex-math></inline-formula> during a more extended time in the laboratory. |
| first_indexed | 2024-04-10T06:36:40Z |
| format | Article |
| id | doaj.art-bfceb5c0c30448bd85b443500443512d |
| institution | Directory Open Access Journal |
| issn | 1943-0655 |
| language | English |
| last_indexed | 2024-04-10T06:36:40Z |
| publishDate | 2023-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj.art-bfceb5c0c30448bd85b443500443512d2023-03-01T00:00:09ZengIEEEIEEE Photonics Journal1943-06552023-01-011521910.1109/JPHOT.2023.324650010049095Experimental Demonstration of LLO Continuous-Variable Quantum Key Distribution With Polarization Loss CompensationTao Shen0https://orcid.org/0000-0001-7854-4364Xiangyu Wang1https://orcid.org/0000-0003-2132-0065Ziyang Chen2https://orcid.org/0000-0002-8343-8029Huiping Tian3https://orcid.org/0000-0003-3618-393XSong Yu4https://orcid.org/0000-0003-1489-9021Hong Guo5https://orcid.org/0000-0003-0644-6698State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, ChinaState Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics, and Center for Quantum Information Technology, Peking University, Beijing, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, ChinaState Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics, and Center for Quantum Information Technology, Peking University, Beijing, ChinaThe compensation process for the state of polarization (SOP) from quantum signal plays an important role in the practical implementation of continuous-variable quantum key distribution (CV-QKD). In contrast to the previous scheme using an expensive digital dynamic polarization controller, we choose a cheaper manual polarization controller interfaced with a digital algorithm based on Kalman filter to achieve compensation of the polarization loss under the condition that the SOP of the fiber is relatively stable. This paper also enumerates the details of other digital signal processing method to achieve final secret key rate. And a pilot-sequential Gaussian modulated coherent state (GMCS) continuous-variable quantum key distribution system with a local local oscillator (LLO) is experimentally implemented based on the analysis of excess noise. Finally, the experimental results show that the method of polarization loss compensation takes advantages in maintaining the stability of the final secret key rate. And a secret key rate of 110 kbps is achieved within 20 km optical fiber (with 4 dB loss) under the finite-size block of <inline-formula><tex-math notation="LaTeX">$1 \times {10^{6}}$</tex-math></inline-formula> during a more extended time in the laboratory.https://ieeexplore.ieee.org/document/10049095/State of polarizationcontinuous-variable quantum key distributionpilot-sequentialKalman filterdigital signal processing |
| spellingShingle | Tao Shen Xiangyu Wang Ziyang Chen Huiping Tian Song Yu Hong Guo Experimental Demonstration of LLO Continuous-Variable Quantum Key Distribution With Polarization Loss Compensation IEEE Photonics Journal State of polarization continuous-variable quantum key distribution pilot-sequential Kalman filter digital signal processing |
| title | Experimental Demonstration of LLO Continuous-Variable Quantum Key Distribution With Polarization Loss Compensation |
| title_full | Experimental Demonstration of LLO Continuous-Variable Quantum Key Distribution With Polarization Loss Compensation |
| title_fullStr | Experimental Demonstration of LLO Continuous-Variable Quantum Key Distribution With Polarization Loss Compensation |
| title_full_unstemmed | Experimental Demonstration of LLO Continuous-Variable Quantum Key Distribution With Polarization Loss Compensation |
| title_short | Experimental Demonstration of LLO Continuous-Variable Quantum Key Distribution With Polarization Loss Compensation |
| title_sort | experimental demonstration of llo continuous variable quantum key distribution with polarization loss compensation |
| topic | State of polarization continuous-variable quantum key distribution pilot-sequential Kalman filter digital signal processing |
| url | https://ieeexplore.ieee.org/document/10049095/ |
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