Continuous-time monitoring of Landau-Zener int5erference in a Cooper-pair box
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en
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4
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Physical Review Letters, Volume 96, issue 18, pp. 1-4
Abstract
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.Description
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Sillanpää, M, Lehtinen, T, Paila, A, Makhlin, Y & Hakonen, P 2006, 'Continuous-time monitoring of Landau-Zener int5erference in a Cooper-pair box', Physical Review Letters, vol. 96, no. 18, 187002, pp. 1-4. https://doi.org/10.1103/PhysRevLett.96.187002