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@ARTICLE{Struck:888904,
      author       = {Struck, Tom and Hollmann, Arne and Schauer, Floyd and
                      Fedorets, Olexiy and Schmidbauer, Andreas and Sawano,
                      Kentarou and Riemann, Helge and Abrosimov, Nikolay V. and
                      Cywiński, Łukasz and Bougeard, Dominique and Schreiber,
                      Lars},
      title        = {{L}ow-frequency spin qubit energy splitting noise in highly
                      purified 28{S}i/{S}i{G}e},
      journal      = {International journal of tourism sciences},
      volume       = {6},
      number       = {1},
      issn         = {2056-6387},
      address      = {London},
      publisher    = {Taylor $\&$ Francis816513},
      reportid     = {FZJ-2020-05309},
      pages        = {40},
      year         = {2020},
      abstract     = {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
                      decreasing time-ensemble spin dephasing time, from
                      T∗2≈ 20 µs, with increasing measurement time over
                      several hours. Despite their strong hyperfine contact
                      interaction, the few 73Ge nuclei overlapping with the
                      quantum dot in the barrier do not limit T∗2, likely
                      because their dynamics is frozen on a few hours measurement
                      scale. We conclude that charge noise and the design of the
                      gradient magnetic field are the key to further improve the
                      qubit fidelity in isotopically purified 28Si/SiGe.},
      cin          = {PGI-11},
      ddc          = {910},
      cid          = {I:(DE-Juel1)PGI-11-20170113},
      pnm          = {144 - Controlling Collective States (POF3-144)},
      pid          = {G:(DE-HGF)POF3-144},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000536095000001},
      doi          = {10.1038/s41534-020-0276-2},
      url          = {https://juser.fz-juelich.de/record/888904},
}