AI 中文总结
研究卫星通信网络中连续变量量子隐形传态受大气影响的问题，采用基于光子添加和减法的非高斯纠缠蒸馏协议，提升了传态保真度和纠缠负性，确定最佳压缩参数，证明该方法在实际卫星网络中改善量子通信的有效性。
AI 中文摘要
基于卫星的自由空间光（FSO）信道上的量子隐形传态（QT）是长距离量子通信的一种有前途的方法。然而，其性能因大气损耗和湍流而显著下降。本文研究了双下行链路场景中的连续变量（CV）QT，其中卫星将纠缠态分配给两个地面站。为减轻信道引起的退化，我们在较弱信道上采用基于顺序应用光子添加和光子减法（PA-PS）的非高斯纠缠蒸馏协议。结果表明，该方案在低至中等（低于600公里）损耗情况下，将隐形传态保真度提高了7.7%，并将纠缠负性提高了约105%。此外，我们确定了平衡纠缠强度和噪声敏感性的最佳压缩参数。这些结果证明了PA-PS蒸馏在改善实际卫星网络中CV量子通信方面的有效性。我们进一步刻画了保真度增益与协议宣告成功概率之间的权衡。
英文摘要
Quantum teleportation (QT) over satellite-based free-space optical (FSO) channels is a promising approach for long-distance quantum communication. However, its performance is significantly degraded by atmospheric loss and turbulence. In this paper, we investigate continuous-variable (CV) QT in a dual-downlink scenario, where a satellite distributes entangled states to two ground stations. To mitigate channel-induced degradation, we employ a non-Gaussian entanglement distillation protocol based on the sequential application of photon addition and photon subtraction (PA-PS) on the weaker channel. The results show that the proposed scheme improves teleportation fidelity by up to 7.7% and enhances entanglement negativity by approximately 105% in the low-to-moderate (below 600 km) loss regime. In addition, we identify an optimal squeezing parameter that balances entanglement strength and noise sensitivity. Taken together, these results demonstrate the effectiveness of PA-PS distillation for improving CV quantum communication in realistic satellite networks. We further characterize the trade-off between fidelity gain and the heralded success probability of the protocol.
CommentsAccepted at the IEEE International Conference on Quantum and Engineering (IEEE Quantum Week 2026, IEEE QCE 2026)
