Complete hyperentangled-Bell-state analysis for quantum communication
Complete hyperentangled-Bell-state analysis for quantum communication
复制标题
量子通信的完整超纠缠贝尔态分析
DOI：
10.1103/physreva.82.032318
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发表时间：
2010-09
影响因子：
2.9
通讯作者：
Deng, Fu-Guo
中科院分区：
文献类型：
--
作者：
Long, Gui Lu;Sheng, Yu-Bo;Deng, Fu-Guo
仅仅依靠线性光学元件是不可能明确区分四个贝尔偏振态的。最近，超纠缠贝尔态，在一个以上的自由度的同时纠缠，已被用来辅助完整的贝尔态分析的四个贝尔态。然而，如果额外的自由度是类量子位的，则只能从16个状态中区分出7个。在这里，我们提出了一种方法来区分超纠缠的贝尔态的交叉克尔非线性的帮助下完全。此外，我们还讨论了它在两个不同自由度的未知态粒子的量子隐形传态和超纠缠态的纠缠交换中的应用。这些应用将增加长距离量子通信的信道容量。
It is impossible to unambiguously distinguish the four Bell states in polarization, resorting to linear optical elements only. Recently, the hyperentangled Bell state, the simultaneous entanglement in more than one degree of freedom, has been used to assist in the complete Bell-state analysis of the four Bell states. However, if the additional degree of freedom is qubitlike, one can only distinguish 7 from the group of 16 states. Here we present a way to distinguish the hyperentangled Bell states completely with the help of cross-Kerr nonlinearity. Also, we discuss its application in the quantum teleportation of a particle in an unknown state in two different degrees of freedom and in the entanglement swapping of hyperentangled states. These applications will increase the channel capacity of long-distance quantum communication.