Indications of a soft cutoff frequency in the charge noise of a Si/SiGe quantum dot spin qubit

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dc.contributor.authorGüngördü, Utkan
dc.contributor.authorKestner, J. P.
dc.date.accessioned2019-02-01T16:45:48Z
dc.date.available2019-02-01T16:45:48Z
dc.date.issued2018-11-14
dc.description.abstractCharacterizing charge noise is of prime importance to the semiconductor spin qubit community. We analyze the echo amplitude data from a recent experiment [Yoneda et al., Nat. Nanotechnol. 13, 102 (2018)] and note that the data shows small but consistent deviations from a 1/fˣ noise power spectrum at the higher frequencies in the measured range. We report the results of using a physical noise model based on two-level fluctuators to fit the data and find that it can mostly explain the deviations. While our results are suggestive rather than conclusive, they provide what may be an early indication of a high-frequency cutoff in the charge noise. The location of this cutoff, where the power spectral density of the noise gradually rolls off from 1/f to 1/f² , crucial knowledge for designing precise qubit control pulses, is given by our fit of the data to be around 200 kHz.en_US
dc.description.sponsorshipThis research was sponsored by the Army Research Of- ce (ARO), and was accomplished under Grant Number W911NF-17-1-0287.en_US
dc.description.urihttps://arxiv.org/abs/1811.06082en_US
dc.format.extent5 pagesen_US
dc.genrejournal articles preprintsen_US
dc.identifierdoi:10.13016/m2e9uj-i1ob
dc.identifier.citationUtkan Güngördü, J. P. Kestner , Indications of a soft cutoff frequency in the charge noise of a Si/SiGe quantum dot spin qubit, Condensed Matter , Mesoscale and Nanoscale Physics, 2018, https://arxiv.org/abs/1811.06082en_US
dc.identifier.urihttp://hdl.handle.net/11603/12688
dc.language.isoen_USen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.subjectcutoff frequencyen_US
dc.subjectnoiseen_US
dc.subjectSi/SiGe quantumen_US
dc.subjectspin qubiten_US
dc.titleIndications of a soft cutoff frequency in the charge noise of a Si/SiGe quantum dot spin qubiten_US
dc.typeTexten_US

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