Continuous-time monitoring of Landau-Zener int5erference in a Cooper-pair box

Mika Sillanpää, Teijo Lehtinen, Antti Paila, Yuriy Makhlin, Pertti Hakonen

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Landau-Zener (LZ) tunneling can occur with a certain probability when crossing energy levels of a quantum two-level system are swept across the minimum energy separation. Here we present experimental evidence of quantum interference effects in solid-state LZ tunneling. We used a Cooper-pair box qubit where the LZ tunneling occurs at the charge degeneracy. By employing a weak nondemolition monitoring, we observe interference between consecutive LZ-tunneling events; we find that the average level occupancies depend on the dynamical phase. The system’s unusually strong linear response is explained by interband relaxation. Our interferometer can be used as a high-resolution Mach-Zehnder–type detector for phase and charge.
Original languageEnglish
Article number187002
Pages (from-to)1-4
Number of pages4
JournalPhysical Review Letters
Issue number18
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed


  • Cooper-pai box
  • Landau-Zener interference
  • Landau-Zener tunneling


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