期刊
NPJ QUANTUM INFORMATION
卷 4, 期 -, 页码 -出版社
SPRINGERNATURE
DOI: 10.1038/s41534-018-0112-0
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类别
资金
- Science, Technology and Innovation Commission of Shenzhen Municipality [ZDSYS20170303165926217, JCYJ20170412152620376]
- Guangdong Innovative and Entrepreneurial Research Team Program [2016ZT06D348]
Rapid progress in semiconductor spin qubits has enabled experimental demonstrations of a two-qubit logic gate. Understanding spin decoherence in a two-qubit logic gate is necessary for optimal qubit operation. We study spin decoherence due to 1/f charge noise for two electrons in a double quantum dot used for a two-qubit controlled-phase gate. In contrast to the usual belief, spin decoherence can be dominated by the tunneling noise from 1/f charge noise instead of the detuning noise. Tunneling noise can dominate because the effect of tunneling noise on the spin qubit is first order in the charge admixture; while the effect of the detuning noise is only second order. The different orders of contributions result in different detuning dependence of the decoherence, which provides a way to identify the noise source. We find that decoherence in a recent two-qubit experiment was dominated by the tunneling noise from 1/f charge noise. The results illustrate the importance of considering tunneling noise to design optimal operation of spin qubits.
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