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首页> 外文期刊>Quantum information processing > $$chi $$ χ -type entangled state]]>
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$$chi $$ χ -type entangled state]]>

机译：<！ /> $$ chi $$ χ -Type entangled状态]]>

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摘要

A violation of a Bell inequality can formally be expressed as a witness for quantum nonlocality. A new four-qubit Bell inequality is optimally violated by $$chi $$ χ -type entangled state, but not by four-qubit GHZ, W and cluster state. Hence, $$chi $$ χ -type entangled state is a good candidate to implement simultaneous dense coding. In this paper, we propose a simultaneous dense coding protocol with genuine four-particle entangled state, $$chi $$ χ -type entangled state, in which two receivers can simultaneously obtain their respective classical information sent by a sender. The double controlled-NOT operator, which is used as the locking operator, play a crucial role in our protocol. The security of simultaneous dense coding is analyzed against the intercept-resend attack. The preparation of $$chi $$ χ -type entangled state has been studied in various physics systems, and it has been experimentally generated with nearly deterministic scheme and high generation rate. Thus, our protocol is feasible with the current experimental technology.
机译：违反贝尔不平等可以正式表达为量子非侦察的见证人。新的四个Qubit贝尔不等式最佳地违反了$$ Chi $$χ-Type纠缠状态，但不是四个Qubit GHz，W和Cluster State。因此，$$ chi $$χ-type纠缠州是一个良好的候选人，实现同时密集的编码。在本文中，我们提出了一种与真正的四粒子纠缠州的同时密集的编码协议，$$ Chi $$χ-Type纠缠状态，其中两个接收器可以同时获取由发件人发送的各自的经典信息。用作锁定操作员的双控不计算子在我们的协议中发挥着至关重要的作用。针对拦截重新发送攻击分析了同时密度编码的安全性。在各种物理系统中研究了$$ Chi $$χ-Type纠缠州的准备，并通过了几乎确定的方案和高发电率进行了实验生成。因此，我们的协议与当前的实验技术是可行的。

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