A simplified entanglement-based quantum secured direct communication system over optical fibers is proposed. Instead of the complicated optical and electronic devices used in the transmitter of standard systems for security checks, a decoy-state generator is integrated with the encoder. This provides a simple yet efficient and easy to implement solution to reveal the presence of intruders. A significant advantage of the proposed system is that it eliminates the need for quantum memory elements in the security check procedure performed in the transmitter. This greatly enhances the information transmission capacity of the quantum channel. All system parameters are defined from commercial specifications to account for components’ non-idealities. A numerical simulation shows that, after a 10-km transmission distance, a quantum state visibility of the polarization entangled Bell state of 88.57% is found, and a maximum coincidence rate of 4 × 107 Hz is achieved.

中文翻译：

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基于线性光学器件的具有诱饵态的简化量子安全直接通信系统

提出了一种基于纠缠的简化量子安全直接通信系统。代替标准系统的发射机中用于安全检查的复杂光学和电子设备，诱骗状态发生器与编码器集成在一起。这提供了一个简单而有效且易于实施的解决方案，以揭示入侵者的存在。所提出的系统的显着优点是，它消除了在发射机中执行的安全检查过程中对量子存储元件的需求。这大大增强了量子信道的信息传输能力。所有系统参数都是根据商业规范定义的，以解决组件的不理想情况。数值模拟表明，在传输10公里后，