Characterize noise correlation and enhance coherence via qubit motion
Abstract
The identification of spacial noise correlation is of critical importance in developing error-corrected quantum devices, but it has barely been studied so far. In this work, we utilize an effective new method called qubit motion, to efficiently determine the noise correlations between any pair of qubits in a 7-qubit superconducting quantum system. The noise correlations between the same pairs of qubits are also investigated when the qubits are at distinct operating frequencies. What's more, in this multi-qubit system with the presence of noise correlations, we demonstrate the enhancing effect of qubit motion on the coherence of logic qubit, and we propose a Motion-CPMG operation sequence to more efficiently protect the logic state from decoherence, which is experimentally demonstrated to extend the decoherence time of logic qubit by nearly one order of magnitude.
Cite
@article{arxiv.2010.14052,
title = {Characterize noise correlation and enhance coherence via qubit motion},
author = {Jiaxiu Han and Zhiyuan Li and Jingning Zhang and Huikai Xu and Kehuan Linghu and Yongchao Li and Chengyao Li and Mo Chen and Zhen Yang and Junhua Wang and Teng Ma and Guangming Xue and Yirong Jin and Haifeng Yu},
journal= {arXiv preprint arXiv:2010.14052},
year = {2020}
}