基于量子码分多址的连续变量量子密钥分发
Quantum code division multiple access based continuous-variable quantum key distribution
AI总结：
本文提出基于量子码分多址（q-CDMA）的连续变量量子密钥分发（CV-QKD）系统，通过混沌编码与同步分离多用户量子态，分析正交分量关系及密钥生成率，数值结果显示其可显著提升双用户密钥生成率。
摘要：
本文提出一种基于量子码分多址（q-CDMA）的连续变量量子密钥分发（CV-QKD）系统。在该系统中，两个发送方（Alice₁,₂）的量子态通过混沌移相器进行混沌编码，然后在量子信道上传输。在接收端，通过混沌同步对量子态进行解码，以分离不同发送方发送的量子态，并分别由两个接收方（Bob₁,₂）接收。我们刻画了两个发送方与接收方之间正交分量的输入输出关系，然后分析了基于q-CDMA的CV-QKD系统的密钥生成率（SKR）。数值结果表明，与不使用q-CDMA方法的单用户情况相比，q-CDMA方法可显著提高两个用户的密钥生成率。
英文摘要：
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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
