The security of QKD is guaranteed by the quantum measurement theory and quantum no cloning theorem.
量子密钥的安全性由量子测量理论和量子不可克隆定理所保证。
Such as the establishment of the safe absolute quantum code system, based on the quantum no-cloning theorem which forbids the quantum information be copied as the classical information.
又如，量子不可克隆定理使得量子信息不能像经典信息那样可以被任意复制，这使得人们能够建立起绝对安全的量子密码系统。
The security for the protocol is ensured by the quantum no-cloning theorem and the secret transmitting order of the single photon sequence.
协议的安全性由量子不可克隆定理和单光子序列的秘密传输顺序所保证。
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