Continuous-variable quantum key distribution based on plug-and-play dual-phase-modulated coherent-states (DPMCS) protocol has been proved to be equivalent to the one-way Gaussian-modulated coherent-states protocol, but it is not just limited to this. This protocol can effectively against the LO-aimed attacks and maintain the system robust. However, the maximum transmission distance of the protocol is restricted due to its large excess noise. In this paper, we enhance the plug-and-play DPMCS protocol using quantum catalysis operation, which can be implemented by the existing technologies. To further highlight the advantage of the implementation of quantum catalysis operation, we make performance comparison not only between the proposed protocol and the original scheme but also the single-photon subtraction-based (SPS) plug-and-play DPMCS protocol. Security analysis shows that the proposed protocol can extend the maximum transmission distance up to hundreds of kilometers even under the effect of the imperfect source noise and show more excellent performance than the SPS-based plug-and-play DPMCS protocol. Furthermore, we also take the finite-size effect into consideration and thus achieve more practical results than those obtained in the asymptotic limit.

中文翻译：

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量子催化提高即插即用双相调制连续变量量子密钥分配的性能

已经证明基于即插即用双相调制相干态（DPMCS）协议的连续变量量子密钥分配等效于单向高斯调制相干态协议，但不仅限于此为此。该协议可以有效抵御LO攻击，并保持系统的健壮性。但是，该协议的最大传输距离由于其较大的过量噪声而受到限制。在本文中，我们使用量子催化操作增强了即插即用的DPMCS协议，该协议可以通过现有技术来实现。为了进一步强调实施量子催化操作的优势，我们不仅在提议的协议和原始方案之间进行性能比较，而且在基于单光子减法（SPS）的即插即用DPMCS协议之间进行性能比较。安全性分析表明，即使在不完美的源噪声的影响下，所提出的协议也可以将最大传输距离扩展到数百公里，并且比基于SPS的即插即用DPMCS协议具有更出色的性能。此外，我们还考虑了有限大小的影响，因此比在渐近极限中获得的结果更实用。