Ham Byoung S
Center for Photon Information Processing, School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju, 61005, South Korea.
Sci Rep. 2020 Jul 15;10(1):11687. doi: 10.1038/s41598-020-68038-7.
Over decades quantum cryptography has been intensively studied for unconditionally secured key distribution in a quantum regime. Due to the quantum loopholes caused by imperfect single photon detectors and/or lossy quantum channels, however, the quantum cryptography is practically inefficient and even vulnerable to eavesdropping. Here, a method of unconditionally secured key distribution potentially compatible with current fiber-optic communications networks is proposed in a classical regime for high-speed optical backbone networks. The unconditional security is due to the quantum superposition-caused measurement indistinguishability between paired transmission channels and its unitary transformation resulting in deterministic randomness corresponding to the no-cloning theorem in a quantum key distribution protocol.
几十年来，量子密码学一直被深入研究，用于在量子领域进行无条件安全的密钥分发。然而，由于不完善的单光子探测器和/或有损量子信道导致的量子漏洞，量子密码学在实际应用中效率低下，甚至容易受到窃听。在此，针对高速光骨干网络，在经典领域提出了一种可能与当前光纤通信网络兼容的无条件安全密钥分发方法。无条件安全性源于量子叠加导致的配对传输信道之间的测量不可区分性及其酉变换，这在量子密钥分发协议中产生了与不可克隆定理相对应的确定性随机性。
