Performance Improvement of Atmospheric Continuous-Variable Quantum Key Distribution with Untrusted Source
Atmospheric continuous-variable quantum key distribution (ACVQKD) has been proven to be secure theoretically with the assumption that the signal source is well protected by the sender so that it cannot be compromised. However, this assumption is quite unpractical in realistic quantum communication s...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-06-01
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| Series: | Entropy |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1099-4300/23/6/760 |
| _version_ | 1797529921525907456 |
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| author | Qin Liao Gang Xiao Shaoliang Peng |
| author_facet | Qin Liao Gang Xiao Shaoliang Peng |
| author_sort | Qin Liao |
| collection | DOAJ |
| description | Atmospheric continuous-variable quantum key distribution (ACVQKD) has been proven to be secure theoretically with the assumption that the signal source is well protected by the sender so that it cannot be compromised. However, this assumption is quite unpractical in realistic quantum communication system. In this work, we investigate a practical situation in which the signal source is no longer protected by the legitimate parts, but is exposed to the untrusted atmospheric channel. We show that the performance of ACVQKD is reduced by removing the assumption, especially when putting the untrusted source at the middle of the channel. To improve the performance of the ACVQKD with the untrusted source, a non-Gaussian operation, called photon subtraction, is subsequently introduced. Numerical analysis shows that the performance of ACVQKD with an untrusted source can be improved by properly adopting the photon subtraction operation. Moreover, a special situation where the untrusted source is located in the middle of the atmospheric channel is also considered. Under direct reconciliation, we find that its performance can be significantly improved when the photon subtraction operation is manipulated by the sender. |
| first_indexed | 2024-03-10T10:21:45Z |
| format | Article |
| id | doaj.art-b8eea2d6a64845978bf6be41394598b3 |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-03-10T10:21:45Z |
| publishDate | 2021-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj.art-b8eea2d6a64845978bf6be41394598b32023-11-22T00:22:16ZengMDPI AGEntropy1099-43002021-06-0123676010.3390/e23060760Performance Improvement of Atmospheric Continuous-Variable Quantum Key Distribution with Untrusted SourceQin Liao0Gang Xiao1Shaoliang Peng2College of Computer Science and Electronic Engineering, Hunan University, Changsha 410082, ChinaCollege of Computer Science and Electronic Engineering, Hunan University, Changsha 410082, ChinaCollege of Computer Science and Electronic Engineering, Hunan University, Changsha 410082, ChinaAtmospheric continuous-variable quantum key distribution (ACVQKD) has been proven to be secure theoretically with the assumption that the signal source is well protected by the sender so that it cannot be compromised. However, this assumption is quite unpractical in realistic quantum communication system. In this work, we investigate a practical situation in which the signal source is no longer protected by the legitimate parts, but is exposed to the untrusted atmospheric channel. We show that the performance of ACVQKD is reduced by removing the assumption, especially when putting the untrusted source at the middle of the channel. To improve the performance of the ACVQKD with the untrusted source, a non-Gaussian operation, called photon subtraction, is subsequently introduced. Numerical analysis shows that the performance of ACVQKD with an untrusted source can be improved by properly adopting the photon subtraction operation. Moreover, a special situation where the untrusted source is located in the middle of the atmospheric channel is also considered. Under direct reconciliation, we find that its performance can be significantly improved when the photon subtraction operation is manipulated by the sender.https://www.mdpi.com/1099-4300/23/6/760continuous-variable quantum key distributionatmospheric channelentanglement sourcephoton subtraction operation. |
| spellingShingle | Qin Liao Gang Xiao Shaoliang Peng Performance Improvement of Atmospheric Continuous-Variable Quantum Key Distribution with Untrusted Source Entropy continuous-variable quantum key distribution atmospheric channel entanglement source photon subtraction operation. |
| title | Performance Improvement of Atmospheric Continuous-Variable Quantum Key Distribution with Untrusted Source |
| title_full | Performance Improvement of Atmospheric Continuous-Variable Quantum Key Distribution with Untrusted Source |
| title_fullStr | Performance Improvement of Atmospheric Continuous-Variable Quantum Key Distribution with Untrusted Source |
| title_full_unstemmed | Performance Improvement of Atmospheric Continuous-Variable Quantum Key Distribution with Untrusted Source |
| title_short | Performance Improvement of Atmospheric Continuous-Variable Quantum Key Distribution with Untrusted Source |
| title_sort | performance improvement of atmospheric continuous variable quantum key distribution with untrusted source |
| topic | continuous-variable quantum key distribution atmospheric channel entanglement source photon subtraction operation. |
| url | https://www.mdpi.com/1099-4300/23/6/760 |
| work_keys_str_mv | AT qinliao performanceimprovementofatmosphericcontinuousvariablequantumkeydistributionwithuntrustedsource AT gangxiao performanceimprovementofatmosphericcontinuousvariablequantumkeydistributionwithuntrustedsource AT shaoliangpeng performanceimprovementofatmosphericcontinuousvariablequantumkeydistributionwithuntrustedsource |