论文标题
独立于设备的量子键分布的上限
Upper bounds on device-independent quantum key distribution
论文作者
论文摘要
量子密钥分布（QKD）是一种通过量子颗粒的传输（例如光子）将秘密钥匙分配给发件人和接收器的方法。独立于设备的量子密钥分布（DIQKD）是QKD的版本，具有更强的安全性概念，因为发件人和接收器仅基于贝尔定理的启发的输入统计信息和设备的输出统计信息。我们研究了在发件人和接收器之间分布的给定的两分量量子状态或连接它们的量子通道之间分布的给定的两分量子状态的速率。我们为QKD的上限超出了可实现的速率提供上限。特别是，我们构建QKD速率显着的状态和渠道，而DIQKD速率可以忽略不计。对于使用标准的后处理技术，用于纠缠两量Quib的状态时，该差距是针对实际情况的说明的。
Quantum key distribution (QKD) is a method that distributes a secret key to a sender and a receiver by the transmission of quantum particles (e.g. photons). Device-independent quantum key distribution (DIQKD) is a version of QKD with a stronger notion of security, in that the sender and receiver base their protocol only on the statistics of input and outputs of their devices as inspired by Bell's theorem. We study the rate at which DIQKD can be carried out for a given bipartite quantum state distributed between the sender and receiver or a quantum channel connecting them. We provide upper bounds on the achievable rate going beyond upper bounds possible for QKD. In particular, we construct states and channels where the QKD rate is significant while the DIQKD rate is negligible. This gap is illustrated for a practical case arising when using standard post-processing techniques for entangled two-qubit states.
