Quantum code division multiple access based continuous-variable quantum key distribution

• URL: http://arxiv.org/abs/2502.09019v1
• Date: Thu, 13 Feb 2025 07:14:57 GMT
• Title: Quantum code division multiple access based continuous-variable quantum key distribution
• Authors: Shahnoor Ali, Neel Kanth Kundu,
• Abstract summary: 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 ($textAlice_1,2$) are chaotically encoded through chaotic phase shifters and then transmitted over a quantum channel. 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.
• Score: 2.3020018305241337
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• Abstract: 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.

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