High-capacity quantum secure direct communication with two-photon six-qubit hyperentangled states
High-capacity quantum secure direct communication with two-photon six-qubit hyperentangled states
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DOI：
10.1007/s11433-017-9100-9
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发表时间：
2017-10
期刊：
影响因子：
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通讯作者：
Fangzhou Wu;Guo‐Jian Yang;Hai-Bo Wang;J. Xiong;F. Alzahrani;A. Hobiny;Fuguo Deng
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文献类型：
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作者：
Fangzhou Wu;Guo‐Jian Yang;Hai-Bo Wang;J. Xiong;F. Alzahrani;A. Hobiny;Fuguo Deng
该研究提出了第一个高容量的量子安全直接通信（QSDC），其中双光子六量子比特超纠缠Bell态在两个光子对的纵向动量和偏振自由度（DOF）中，它可以使用两个0.5 mm厚的I型β硼酸钡晶体板和一个八孔屏幕来产生。秘密信息可以独立地编码在光子对上，在所有三个自由度中具有64个酉操作。该协议具有比以前的QSDC协议更高的容量，因为每个光子对可以携带6比特的信息，而不仅仅是2或4比特。我们的QSDC协议通过利用诱骗光子来检查第一个光子序列传输的安全性，从而降低了环境噪声对退相干的影响。与双向QSDC协议相比，我们的QSDC协议是免疫攻击的窃听者使用特洛伊木马攻击策略，因为它是一个单向的量子通信。QSDC协议的这些特点使其在未来的量子通信中具有良好的应用前景。
This study proposes the first high-capacity quantum secure direct communication (QSDC) with two-photon six-qubit hyper-entangled Bell states in two longitudinal momentum and polarization degrees of freedom (DOFs) of photon pairs, which can be generated using two 0.5 mm-thick type-Iβbarium borate crystal slabs aligned one behind the other and an eight-hole screen. The secret message can be independently encoded on the photon pairs with 64 unitary operations in all three DOFs. This protocol has a higher capacity than previous QSDC protocols because each photon pair can carry 6 bits of information, not just 2 or 4 bits. Our QSDC protocol decreases the influence of decoherence from environment noise by exploiting the decoy photons to check the security of the transmission of the first photon sequence. Compared with two-way QSDC protocols, our QSDC protocol is immune to an attack by an eavesdropper using Trojan horse attack strategies because it is a one-way quantum communication. The QSDC protocol has good applications in the future quantum communication because of all these features.