耦合对相对论效应下的三次谐波的影响

研究了相对论效应引起的场量的非线性对谐波辐射源的影响；在入射光为长脉冲激光并计及各阶谐波间的耦合时，解析研究了三次谐波的振幅、频率、相位的变化及增长与饱和特性并计算了转化率，结果表明谐波间的耦合使幅值和转化率减少。     

嵌入式Linux环境下的量子密钥协商系统开发

密钥协商是连续变量量子密钥分发中不可或缺的组成部分,本文介绍了如何利用Xilinx ML405开发板,实现嵌入式Linux系统移植。同时进行了Linux环境下的量子密钥协商系统开发,实现了量子通信系统平台的控制系统核心功能,并实验验证了自适应区间划分协商算法的有效性。     

A quantum identification scheme based on polarization modulation

A quantum identification scheme including registration and identification phases is proposed. The users‘ passwords are transmitted by qubit string and recorded as a set of quantum operators. The security of the proposed scheme is guaranteed by the no-cloning theorem. Based on photon polarization modulation, an experimental approach is also designed to implement our proposed scheme.     

基于符合测量机制的光学信息保护

提出了一种基于符合测量机制的光学信息保护方法.发送方选择一定的载波信号将待传输的信息加载在待成像的物体上,接收方进行符合测量,并根据双方之间的协议从测量得到的物体的空间分布信息中解密出信息.计算机仿真结果表明,该方案能够成功实现信息的保护,具有良好的安全性.     

Practical security of continuous-variable quantum key distribution under finite-dimensional effect of multi-dimensional reconciliation

The well-known multi-dimensional reconciliation is an effective method used in the continuous-variable quantum key distribution in the long-distance and the low signal-to-noise-ratio scenarios. The virtual channel employed to exchange data is generally established by using a finite-dimensional rotation in the reconciliation procedure. In this paper, we found that the finite dimension of the multi-dimensional reconciliation inevitably leads to the mismatch of the signal-to-noise-ratio between the quantum channel and the virtual channel, which may be called the finite-dimension effect. Such an effect results in an overestimation on the secret key rate, and subsequently induces vital practical security loopholes.     

Novel Quantum Secret Sharing and Controlled Communication Schemes Based on Einstein-Podolsky-Rosen Correlations

Employing quantum registers, we first proposed a novel （2, 3） quantum threshold scheme based on Einstein- Podolsky Rosen （EPR） correlations in this letter. Motivated by the present threshold scheme, we also propose a controlled communication scheme to transmit the secret message with a controller. In the communication protocol, the encoded quantum message carried by particles sequence, is transmitted by legitimate communicators.     

基于二进制均匀调制相干态的量子密钥分发方案

提出了一种基于二进制均匀调制相干态的量子密钥分发方案. 相对于高斯调制相干态量子密钥分发方案中的高斯信源,二进制信源是最简单的信源,二进制调制是目前数字光纤通信中最普遍的调制方式,技术上容易实现. 采用Shannon信息论分析了该协议抵抗光束分离攻击的能力,得到秘密信息速率与调制参数、解调参数以及信道参数之间的解析表达式. 关键词： 量子密钥分发 二进制调制 光束分离攻击     

基于纠缠的数据链路层量子通信协议

利用量子力学中的纠缠关联性，提出了数据链路层的量子通信协议. 该协议把线路分为忙闲时段，量子纠缠态的分发预先在闲时段完成，数据经由经典链路发送，确认帧经由量子纠缠信道发送. 量子信息的传输可以是瞬时的，因此两个发送成功的数据帧之间的最小时间间隔可以大为减小. 研究表明该协议能有效地提高数据链路的最大吞吐量，改善数据链路层停止等待协议的性能. 关键词： 量子通信 纠缠 停止等待协议 数据链路     

Multiparty Quantum Secret Sharing of Quantum States with Quantum Registers

A quantum secret sharing scheme is proposed by making use of quantum registers. In the proposed scheme, secret message state is encoded into multipartite entangled states. Several identical multi-particle entanglement states are generated and each particle of the entanglement state is filled in different quantum registers which act as shares of the secret message. Two modes, i.e. the detecting mode and the message mode, are employed so that the eavesdropping can be detected easily and the secret message may be recovered. The security analysis shows that the proposed scheme is secure against eavesdropping of eavesdropper and cheating of participants.     

基于双模压缩态的量子密钥分发方案

提出了一种基于双模压缩态的量子密钥分发方案，采用Shannon信息论分析了该协议抵抗光束分离攻击的能力，得到秘密信息速率与压缩因子、信道参数之间的解析表达式，双模压缩态的模间关联性保证了该方案的安全性.