Characterize noise correlation and enhance coherence via qubit motion
- URL: http://arxiv.org/abs/2010.14052v1
- Date: Tue, 27 Oct 2020 05:11:53 GMT
- Title: Characterize noise correlation and enhance coherence via qubit motion
- Authors: Jiaxiu Han, Zhiyuan Li, Jingning Zhang, Huikai Xu, Kehuan Linghu,
Yongchao Li, Chengyao Li, Mo Chen, Zhen Yang, Junhua Wang, Teng Ma, Guangming
Xue, Yirong Jin, Haifeng Yu
- Abstract summary: 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.
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.
- Score: 13.708625628370951
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- 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.
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