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• W3100692382 abstract "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." @default.
• W3100692382 created "2020-11-23" @default.
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• W3100692382 date "2018-11-27" @default.
• W3100692382 modified "2023-09-26" @default.
• W3100692382 title "Spin decoherence in a two-qubit CPHASE gate: the critical role of tunneling noise" @default.
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• W3100692382 doi "https://doi.org/10.1038/s41534-018-0112-0" @default.
• W3100692382 hasPublicationYear "2018" @default.
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