用约瑟夫森电荷比特系统实现一种特殊量子态的传输

Using Josephson charge qubits system to realize the transfer of a special kind of quantum state

构造了一种约瑟夫森电荷量子比特电路系统,并研究了四量子位态在该系统中的传输特性.对均匀与非均匀传输通道两种情形分别讨论了怎样通过控制外加磁通来实现激发态|1〉从第一量子位到第四量子位的理想传输.此外还分析了量子态在该系统中传输时的平均保真度,结果表明该系统不能传输一个任意态.

A type of Josephson charge qubit circuit is constructed in this paper,and properties of four-qubit quantum state transfer through this system is also investigated. By modulating the external magnetic flux,we show that ideal transfer of an excited state ｜1〉from the first qubit to the fourth qubit can be realized for both homogeneous and inhomogeneous transmission channels. Moreover,the average fidelity of state transfer across this system is also analyzed,the result revealed that it cannot be used to transfer an arbitrary quantum state.