计算：量子密码理论上是无法破解的。
计算：量子密码理论上是无法破解的。但和任何安全系统一样，在实践中其安全度取决于系统里最薄弱的一环。
Computing: Quantum cryptography is unbreakable in theory. But like any security system, in practice it is only as safe as its weakest link.
随着量子密码学在理论和实验上的飞速进展，点对点的量子密钥分发系统已经可以商用。
As rapid progress in theory and experiment of quantum cryptography, point-to-point quantum key distribution (QKD) systems are already commercial available.
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