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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2304.05880 |
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| _version_ | 1866917715743080448 |
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| author | Wang, Rong Fan-Yuan, Guan-Jie Yin, Zhen-Qiang Wang, Shuang Li, Hong-Wei Yao, Yao Chen, Wei Guo, Guang-Can Han, Zheng-Fu |
| author_facet | Wang, Rong Fan-Yuan, Guan-Jie Yin, Zhen-Qiang Wang, Shuang Li, Hong-Wei Yao, Yao Chen, Wei Guo, Guang-Can Han, Zheng-Fu |
| contents | The study of quantum information processing seeks to characterize the resources that enable quantum information processing to perform tasks that are unfeasible or inefficient for classical information processing. Quantum cryptography is one such task, and researchers have identified entanglement as a sufficient resource for secure key generation. However, quantum discord, another type of quantum correlation beyond entanglement, has been found to be necessary for guaranteeing secure communication due to its direct relation to information leakage. Despite this, it is a long-standing problem how to make use of discord to analyze security in a specific quantum cryptography protocol. Here, based on our proposed quantum discord witness recently, we successfully address this issue by considering a BB84-like quantum key distribution protocol and its equivalent entanglement-based version. Our method is robust against imperfections in qubit sources and qubit measurements as well as basis misalignment due to quantum channels, which results in a better key rate than standard BB84 protocol. Those advantages are experimentally demonstrated via photonic phase encoding systems, which shows the practicality of our results. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_05880 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Secure Key from Quantum Discord Wang, Rong Fan-Yuan, Guan-Jie Yin, Zhen-Qiang Wang, Shuang Li, Hong-Wei Yao, Yao Chen, Wei Guo, Guang-Can Han, Zheng-Fu Quantum Physics The study of quantum information processing seeks to characterize the resources that enable quantum information processing to perform tasks that are unfeasible or inefficient for classical information processing. Quantum cryptography is one such task, and researchers have identified entanglement as a sufficient resource for secure key generation. However, quantum discord, another type of quantum correlation beyond entanglement, has been found to be necessary for guaranteeing secure communication due to its direct relation to information leakage. Despite this, it is a long-standing problem how to make use of discord to analyze security in a specific quantum cryptography protocol. Here, based on our proposed quantum discord witness recently, we successfully address this issue by considering a BB84-like quantum key distribution protocol and its equivalent entanglement-based version. Our method is robust against imperfections in qubit sources and qubit measurements as well as basis misalignment due to quantum channels, which results in a better key rate than standard BB84 protocol. Those advantages are experimentally demonstrated via photonic phase encoding systems, which shows the practicality of our results. |
| title | Secure Key from Quantum Discord |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2304.05880 |