Continuous-Time Monitoring of Landau-Zener Interference in a Cooper-Pair Box
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© 2006 American Physical Society (APS). This is the accepted version of the following article: Sillanpää, Mika A. & Lehtinen, Teijo & Paila, Antti & Makhlin, Yuriy & Hakonen, Pertti. 2006. Continuous-Time Monitoring of Landau-Zener Interference in a Cooper-Pair Box. Physical Review Letters. Volume 96, Issue 18. 187002/1-4. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.96.187002, which has been published in final form at http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.96.187002.
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en
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187002/1-4
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Physical Review Letters, Volume 96, Issue 18
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, Mika A. & Lehtinen, Teijo & Paila, Antti & Makhlin, Yuriy & Hakonen, Pertti. 2006. Continuous-Time Monitoring of Landau-Zener Interference in a Cooper-Pair Box. Physical Review Letters. Volume 96, Issue 18. 187002/1-4. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.96.187002.