Quantum code division multiple access based continuous-variable quantum key distribution
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866917920841400320 |
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| author | Ali, Shahnoor Kundu, Neel Kanth |
| author_facet | Ali, Shahnoor Kundu, Neel Kanth |
| contents | In this paper, we propose a quantum code division multiple access (q-CDMA) based continuous-variable quantum key distribution (CV-QKD) system. In the proposed system, the quantum states of two senders ($\text{Alice}_{1,2}$) are chaotically encoded through chaotic phase shifters and then transmitted over a quantum channel. At the receiver, the quantum states are decoded via chaos synchronization to separate the quantum states sent by the different senders and received by the two receivers ($\text{Bob}_{1,2}$) separately. We characterize the input-output relation of the quadrature between the two senders and receivers and then analyze the secret key rate (SKR) of the q-CDMA-based CV-QKD system. Our numerical results reveal that the q-CDMA approach can significantly enhance the SKR for both users when compared to the single-user case without the q-CDMA approach. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_09019 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum code division multiple access based continuous-variable quantum key distribution Ali, Shahnoor Kundu, Neel Kanth Quantum Physics Signal Processing In this paper, we propose a quantum code division multiple access (q-CDMA) based continuous-variable quantum key distribution (CV-QKD) system. In the proposed system, the quantum states of two senders ($\text{Alice}_{1,2}$) are chaotically encoded through chaotic phase shifters and then transmitted over a quantum channel. At the receiver, the quantum states are decoded via chaos synchronization to separate the quantum states sent by the different senders and received by the two receivers ($\text{Bob}_{1,2}$) separately. We characterize the input-output relation of the quadrature between the two senders and receivers and then analyze the secret key rate (SKR) of the q-CDMA-based CV-QKD system. Our numerical results reveal that the q-CDMA approach can significantly enhance the SKR for both users when compared to the single-user case without the q-CDMA approach. |
| title | Quantum code division multiple access based continuous-variable quantum key distribution |
| topic | Quantum Physics Signal Processing |
| url | https://arxiv.org/abs/2502.09019 |