Security of quantum key distribution using d-level systems -: art. no. 127902
Security of quantum key distribution using d-level systems -: art. no. 127902
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DOI：
10.1103/physrevlett.88.127902
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发表时间：
2002-03-25
影响因子：
8.6
通讯作者：
Gisin, N
中科院分区：
文献类型：
--
作者：
Cerf, NJ;Bourennane, M;Gisin, N
我们考虑了两种依赖于将密钥编码成量子比特的量子密码方案，即d维希尔伯特空间中的量子态。第一个密码系统使用两个相互无偏的碱基（从而扩展了BB84方案），而第二个密码系统利用了所有d + 1个可用的碱基（扩展了量子比特的六状态协议）。我们推导了潜在的窃听者应用基于克隆的个体攻击所获得的信息，以及错误率的上限，以确保对连贯攻击的无条件安全。
We consider two quantum cryptographic schemes relying on encoding the key into qudits, i.e., quantum states in a d-dimensional Hilbert space. The first cryptosystem uses two mutually unbiased bases (thereby extending the BB84 scheme), while the second exploits all d + 1 available such bases (extending the six-state protocol for qubits). We derive the information gained by a potential eavesdropper applying a cloning-based individual attack, along with an upper bound on the error rate that ensures unconditional security against coherent attacks.