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Low-frequency spin qubit energy splitting noise in highly purified 28Si/SiGe

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Struck, Tom ; Holland, Arne ; Schauer, Floyd ; Fedorets, Olexiy ; Schmidbauer, Andreas ; Sawano, Kentarou ; Riemann, Helge ; Abrosimov, Nikolay V. ; Cywinski, Lukasz ; Bougeard, Dominique ; Schreiber, Lars R.
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Date of publication of this fulltext: 18 Jun 2020 06:53


We identify the dominant source for low-frequency spin qubit splitting noise in a highly isotopically-purified silicon device with an embedded nanomagnet and a spin echo decay time Techo2 = 128 µs. The power spectral density (PSD) of the charge noise explains both, the clear transition from a 1/f2- to a 1/f-dependence of the splitting noise PSD as well as the experimental observation of a ...


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