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Suppression of Dephasing by Qubit Motion in Superconducting Circuits
Averin, D. V. Xu, Kai Zhong, You-Peng Song, C. Wang, H. Han, Siyuan
Averin, D. V.
Xu, Kai
Zhong, You-Peng
Song, C.
Wang, H.
Han, Siyuan
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Abstract
We suggest and demonstrate a protocol which suppresses the low-frequency dephasing by qubit motion, i.e., transfer of the logical qubit of information in a system of n≥2 physical qubits. The protocol requires only the nearest-neighbor coupling and is applicable to different qubit structures. Our analysis of its effectiveness against noises with arbitrary correlations, together with experiments using up to three superconducting qubits, shows that for the realistic uncorrelated noises, qubit motion increases the dephasing time of the logical qubit as =√n. In general, the protocol provides a diagnostic tool for measurements of the noise correlations.
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This work was supported by the National Basic Research Program of China (Grants No. 2014CB921200 and No. 2012CB927404), U.S. NSF Grants No. PHY-1314758 and No. PHY-1314861, the National Natural Science Foundation of China (Grants
No. 11434008 and No. 11222437), and the Zhejiang Provincial Natural Science Foundation of China (Grant No. LR12A04001).
Date
2016-01-08
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American Physical Society
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Averin, D., Xu, K., Zhong, Y., Song, C., Wang, H., & Han, S. (2016). Suppression of Dephasing by Qubit Motion in Superconducting Circuits. Physical Review Letters, 116(1). doi:10.1103/physrevlett.116.010501