Coupling of Josephson current qubits using a connecting loop
介观与纳米尺度物理
2009-11-10 v3 超导电性
摘要
We propose a coupling scheme for the three-Josephson junction qubits which uses a connecting loop, but not mutual inductance. Present scheme offers the advantages of a large and tunable level splitting in implementing the controlled-NOT (CNOT) operation. We calculate the switching probabilities of the coupled qubits in the CNOT operations and demonstrate that present CNOT gate can meet the criteria for the fault-tolerant quantum computing. We obtain the coupling strength as a function of the coupling energy of the Josephson junction and the length of the connecting loop which varies with selecting two qubits from the scalable design.
引用
@article{arxiv.cond-mat/0305127,
title = {Coupling of Josephson current qubits using a connecting loop},
author = {Mun Dae Kim and Jongbae Hong},
journal= {arXiv preprint arXiv:cond-mat/0305127},
year = {2009}
}
备注
5 pages with updates, version to appear in Phys. Rev. B