Boyer et al put forward the first semi-quantum key distribution (BKM2007), which is completely robust while one side is limited. However, its efficiency is not satisfactory. In this paper, we present a high-efficient semi-quantum key distribution. The efficiency for qubits is approximately 50% while that is approximately 25% in the BKM2007 protocol, which means that the sifted key proportion of the SQKD protocol is double as that in the BKM2007 protocol. Furthermore, the proportion of information bits in our SQKD protocol is not lower than that of the BKM2007 protocol. Analysis shows that our protocol is still robust.
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机译：Boyer et al提出了第一个半量子密钥分布（BKM2007），即一侧有限。然而，其效率并不令人满意。在本文中，我们提出了一种高效的半量子密钥分布。 Qubits的效率约为50％，而BKM2007协议的效率约为25％，这意味着SQKD协议的筛选密钥比例是BKM2007协议中的双倍。此外，我们的SQKD协议中信息比特的比例不低于BKM2007协议的比例。分析表明，我们的协议仍然是强大的。
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