Free-space continuous-variable quantum key distribution under high background noise
Abstract One of the difficulties in the application of quantum communication is the fragility of its encoded quantum states. Conventional quantum key distribution (QKD) requires strict filtering operations at the receiver. Any ambient light entering the system can significantly increase the bit erro...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-03-01
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| Series: | npj Quantum Information |
| Online Access: | https://doi.org/10.1038/s41534-025-01009-w |
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| _version_ | 1850063501320519680 |
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| author | Xue-Tao Zheng Qi-Fa Zhang Jie Ling Guang-Can Guo Zheng-Fu Han |
| author_facet | Xue-Tao Zheng Qi-Fa Zhang Jie Ling Guang-Can Guo Zheng-Fu Han |
| author_sort | Xue-Tao Zheng |
| collection | DOAJ |
| description | Abstract One of the difficulties in the application of quantum communication is the fragility of its encoded quantum states. Conventional quantum key distribution (QKD) requires strict filtering operations at the receiver. Any ambient light entering the system can significantly increase the bit error rate and even render the system inoperable. We present a continuous-variable quantum key distribution (CV-QKD) system that can function effectively during the day or even on rainy days without complex filtering operations. The Gaussian modulated coherent state continuous-variable quantum key distribution (GMCS CV-QKD) system demonstrates robustness, maintaining a secure key rate (SKR) of more than 100 kbps when operating at a frequency of 10 MHz, which lays the foundation for low-cost, highly robust free-space quantum communication. |
| format | Article |
| id | doaj-art-bb29389cdff34a6da7ddb1f78723cdbe |
| institution | DOAJ |
| issn | 2056-6387 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Information |
| spelling | doaj-art-bb29389cdff34a6da7ddb1f78723cdbe2025-08-20T02:49:35ZengNature Portfolionpj Quantum Information2056-63872025-03-011111810.1038/s41534-025-01009-wFree-space continuous-variable quantum key distribution under high background noiseXue-Tao Zheng0Qi-Fa Zhang1Jie Ling2Guang-Can Guo3Zheng-Fu Han4CAS Key Laboratory of Quantum Information, University of Science and Technology of ChinaAnhui Asky Quantum Technology Co. Ltd.Anhui Asky Quantum Technology Co. Ltd.CAS Key Laboratory of Quantum Information, University of Science and Technology of ChinaCAS Key Laboratory of Quantum Information, University of Science and Technology of ChinaAbstract One of the difficulties in the application of quantum communication is the fragility of its encoded quantum states. Conventional quantum key distribution (QKD) requires strict filtering operations at the receiver. Any ambient light entering the system can significantly increase the bit error rate and even render the system inoperable. We present a continuous-variable quantum key distribution (CV-QKD) system that can function effectively during the day or even on rainy days without complex filtering operations. The Gaussian modulated coherent state continuous-variable quantum key distribution (GMCS CV-QKD) system demonstrates robustness, maintaining a secure key rate (SKR) of more than 100 kbps when operating at a frequency of 10 MHz, which lays the foundation for low-cost, highly robust free-space quantum communication.https://doi.org/10.1038/s41534-025-01009-w |
| spellingShingle | Xue-Tao Zheng Qi-Fa Zhang Jie Ling Guang-Can Guo Zheng-Fu Han Free-space continuous-variable quantum key distribution under high background noise npj Quantum Information |
| title | Free-space continuous-variable quantum key distribution under high background noise |
| title_full | Free-space continuous-variable quantum key distribution under high background noise |
| title_fullStr | Free-space continuous-variable quantum key distribution under high background noise |
| title_full_unstemmed | Free-space continuous-variable quantum key distribution under high background noise |
| title_short | Free-space continuous-variable quantum key distribution under high background noise |
| title_sort | free space continuous variable quantum key distribution under high background noise |
| url | https://doi.org/10.1038/s41534-025-01009-w |
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