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提出在实际噪声情况下的小型量子网络直接通信网络模型,在通信之前所有量子网络节点共享多粒子的非最大纠缠态(W态)。发送节点将手中共享的W态的某个粒子作为控制比特、需要传输秘密信息的粒子作为目标比特,通过量子控制非门(CNOT)操作,将需要传输的秘密信息粒子和W态建立纠缠关系,之后通过实际量子信道发送出去;接收节点将手中共享态W态的粒子作为控制比特、接收到的秘密信息粒子作为目标比特,再次应用CNOT门操作从而获得含误码的秘密信息粒子,然后将秘密信息粒子中的检测粒子取出,检测通信过程中是否有窃听者(Eve),并将剩余的秘密信息应用奇偶校验矩阵纠正由于信道噪声引起的量子比特翻转错误。之后对方案的安全、吞吐效率、通信效率等进行了分析和讨论。
In the case of real noise, a small network model of direct communication network is proposed. All the nodes in quantum network share multipartite non-maximally entangled states (W state) prior to communication. The sending node needs a particle of the secret information to be transmitted as a control bit by using a particle in the W state shared by the sending node as a target bit and establishes an entanglement relation between the secret information particle to be transmitted and the W state through a quantum control non- And then sent out through the actual quantum channel. The receiving node takes the particles in the shared W state in the hands as control bits and the received secret information particles as the target bits, and then applies the CNOT gate operation again to obtain the secret information particles with errors, and then sends the secret The detection particles in the information particle are taken out to detect whether there is an eavesdropper (Eve) in the communication process, and the residual secret information is corrected by a parity check matrix to correct the quantum bit flip error caused by the channel noise. After that, the security, throughput efficiency, communication efficiency and so on were analyzed and discussed.