用非最大纠缠信道实现量子态的理想传输

为了使用非最大纠缠量子态作为传输信道实现量子态的理想传输,在接收端提出可逆纠缠匹配方法。该方法通过隐形传输中的张量表达式求出Bell基和2粒子计算基之间的过渡矩阵(测量矩阵),待发送端执行完Bell基测量,接收端得到坍缩态后引入若干个粒子组成辅助信道,从接收端量子态的张量表达式中可以看出辅助信道和传输信道以及测量矩阵之间的内在关系,利用此关系令辅助信道参数矩阵为传输信道参数矩阵和测量矩阵的乘积的逆矩阵,接收端对持有粒子和辅助信道进行Bell基测量和变换,即可恢复出初始态。该方法与引入单粒子辅助量子态的方法相比,可以实现量子态的理想传输。

Perfect teleportation via a non-maximally entangled quantum channel

To realize a perfect teleportation instead of probabilistic teleportation through a non-maximally entangled quantum channel,an invertible entanglement matching method is introduced.This method is based on tensor expression in teleportation.The basis transformation matrix(measure matrix) between standard Bell basis and two-qubit entangled state basis is constructed firstly.An auxiliary quantum channel by using several qubits after Alice's Bell basis measurement is then constructed by Bob.This auxiliary channel demands that auxiliary channel parameter matrix must be equal to invertible matrix of multiplication of transmission channel parameter matrix and measure matrix.By using this method,perfect quantum teleportation can be achieved.