High‐Capacity Multi‐Pair Continuous‐Variable Quantum Network Coding Based on Microcavity Frequency Comb

ABSTRACT

Continuous‐variable quantum network coding (CVQNC) faces several challenges when extended to large scale scenarios, including the insufficient channel capacity, low entanglement generation efficiency, and degradation of entanglement under channel loss. In this study, a high‐capacity CVQNC scheme based on microcavity frequency combs is proposed over the butterfly network, which enables parallel quantum information transmission among multiple user pairs by exploiting network coding at the bottleneck link. Furthermore, an entanglement enhancement strategy combining mode multiplexing with quantum scissors is introduced to reduce the entanglement degradation caused by channel loss. The results show that the proposed scheme improves the entanglement enhancement efficiency, channel capacity, transmission fidelity, and security while scaling to a larger number of users.