徐令予博客
考槃在澗，碩人之寬。獨寐寤言，永矢弗諼。考槃在阿，碩人之薖。獨寐寤歌，永矢弗過。考槃在陸，碩人之軸。獨寐寤宿，永矢弗告。
2019年12月，美國防部國防科學委員會發布《量子技術的應用》報告的摘要。摘要概述了量子傳感、量子計算，以及量子通信與糾纏分發領域的主要發現，認為量子傳感係統、計算及通信係統的應用將為美國防部開創量子使能能力的新時代，並就如何發展提出建議。
在關於(量子)通信係統部分，該報告摘要明確指出：理論上量子密鑰分發可提供香農信息論定義的密碼安全，但其能力和安全還存在欠缺，不能供美國防部使用。
該報告摘要的中文版鏈接地址：美國防科學委員會發布報告分析 量子技術的未來應用
為避免翻譯中的歧義，特摘錄有關量子通信部份的原文如下：
Quantum Information Science: Applications, Global Research and Development, and Policy Considerations
Quantum key distribution (QKD) is a method of securing communications that uses quantum physics, rather than mathematical algorithms, to safeguard data sent over unprotected networks. However, signals traveling over fiber-optic cable weaken at about 60 miles and must be retransmitted. Quantum repeaters can extend the distance the signal can be sent, but they significantly increase the complexity of the process. The communications are not only secure, but any eavesdropping attempt will destroy the communication, revealing the eavesdropping attempt.
The Chinese government has been spending heavily on QKD, but many analysts in North America and Europe do not believe that the benefits over existing nonquantum technologies outweigh the costs associated with QKD, making commercial demand difficult to ascertain.[6]
…………………………………………………
[6]Assessment of the Future Economic Impact of Quantum Information Science, IDA.
Congressional Research Service 2
##########
• Finding 6: In principle, quantum key distribution (QKD) provides natural information theoretic (Shannon) cryptographic security. QKD systems do not support authenticated key exchange.
• Finding 7: QKD has not been implemented with sufficient capability or security to be deployed for DoD mission use. The Task Force concurs with the National Security Agency (NSA)’s assessment of QKD certification.
• Finding 8: QKD developments and use by foreign parties should be understood and tracked.
