二量子比特混合态隐形传输保真度研究

Study of teleportation fidelity for mixed two-qubit state

针对二量子比特混合态系统,利用描述态的密度矩阵研究了CHSH违反、混合度与隐形传输保真度的关系。通过共生纠缠度确定了隐形传输保真度的上、下限。结果表明,二量子比特混合态在CHSH违反最大位置或混合度最小位置获得最大隐形传输保真度,并可以通过增加共生纠缠度来提高隐形传输保真度。

To the mixed tow-qubit state system, relationship among CHSH violation, mixedness and the fidelity of teleportation is studied with density matrix. By means of concurrence, the lower and upper bounds of the fidelity of teleportation is determined. Results show that maximum fidelity of teleportation can be obtained when CHSH violation is in maximal position or mixedness is in minimal. In addition, the fidelity of teleportation can be improved by increasing concurrence.