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@INPROCEEDINGS{Willsch:1007055,
      author       = {Willsch, Dennis},
      title        = {{O}bservation of {J}osephson {H}armonics in {T}unnel
                      {J}unctions},
      school       = {Chalmers University},
      reportid     = {FZJ-2023-01953},
      year         = {2023},
      abstract     = {The Josephson effect is the keystone of quantum computing
                      with superconductinghardware. In this talk, I will show that
                      the celebrated sin(phi) Josephsonrelation fails to fully
                      describe the measured energy spectra of many
                      transmonsamples. While the microscopic theory of Josephson
                      junctions contains higherharmonics sin(2*phi), sin(3*phi),
                      ..., these have generally been considerednegligible in
                      tunnel junctions. However, this assumption is unjustified
                      due tothe non-uniformity of the commonly used AlOx tunnel
                      barriers, which can causehigh-transparency conduction
                      channels. Indeed, by including the Josephsonharmonics in the
                      transmon Hamiltonian, we can greatly improve the
                      agreementbetween computed and measured energy spectra. The
                      observation of Josephsonharmonics in tunnel junctions
                      prompts a reevaluation of our theoretical modelsfor
                      superconducting hardware.},
      month         = {Apr},
      date          = {2023-04-26},
      organization  = {WACQT Virtual Workshop on Quantum
                       Technology, Online (Sweden), 26 Apr
                       2023 - 27 Apr 2023},
      subtyp        = {Invited},
      cin          = {JSC},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {5111 - Domain-Specific Simulation $\&$ Data Life Cycle Labs
                      (SDLs) and Research Groups (POF4-511)},
      pid          = {G:(DE-HGF)POF4-5111},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1007055},
}