有效的抗无信令窃听的量子密钥分发
Efficient quantum key distribution secure against no-signalling eavesdroppers
摘要：
通过对纠缠态进行测量，双方可以生成一个密钥，该密钥不仅对受量子力学约束的窃听者是安全的，而且对仅受无信号原理约束的假设的“后量子”窃听者也是安全的。我们介绍了一个家庭的这种类型的量子密钥分发协议，这是更有效的比以前的，无论是在密钥速率和抗噪声。有趣的是，最好的协议涉及大量的测量。我们表明，在没有噪声的情况下，这些协议可以产生一个秘密比特每个纠缠比特，这意味着在无信令后量子的情况下的密钥速率是在通常的量子密钥分发的密钥速率相媲美。
英文摘要：
By carrying out measurements on entangled states, two parties can generate a secret key which is secure not only against an eavesdropper bound by the laws of quantum mechanics, but also against a hypothetical "post-quantum" eavesdroppers limited by the no-signalling principle only. We introduce a family of quantum key distribution protocols of this type, which are more efficient than previous ones, both in terms of key rate and noise resistance. Interestingly, the best protocols involve large number of measurements. We show that in the absence of noise, these protocols can yield one secret bit per entanglement bit, implying that the key rates in the no-signalling post-quantum scenario are comparable to the key rates in usual quantum key distribution.
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