Quantum cryptology is a new method for secret communications.This new method utilizes the quantum nature of single photons. 量子密碼術是一種實現秘密通信的新方法，它利用單光子的量子性質，藉助量子密鑰分配協議可實現數據傳輸的可證性安全。
In a quantum cryptographic system, any interloper tapping into the stream of photons will alter them in a way that is detectable to the sender and the receiver. 在量子密碼系統里，任何竊取者在偷看光子束時都會更動到它，而被發送者或接收者察覺。
