Efficient evaluation of decoherence rates in complex Josephson circuits

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dc.creatorDiVincenzo, David P.
dc.creatorBrito, Frederico
dc.creatorKoch, Roger H.
dc.date2005-10-31
dc.date2005-11-15
dc.date.accessioned2026-07-07T06:45:43Z
dc.date.available2026-07-07T06:45:43Z
dc.descriptionA complete analysis of the decoherence properties of a Josephson junction qubit is presented. The qubit is of the flux type and consists of two large loops forming a gradiometer and one small loop, and three Josephson junctions. The contributions to relaxation (T_1) and dephasing (T_ϕ) arising from two different control circuits, one coupled to the small loop and one coupled to a large loop, is computed. We use a complete, quantitative description of the inductances and capacitances of the circuit. Including two stray capacitances makes the quantum mechanical modeling of the system five dimensional. We develop a general Born-Oppenheimer approximation to reduce the effective dimensionality in the calculation to one. We explore T_1 and T_ϕalong an optimal line in the space of applied fluxes; along this "S line" we see significant and rapidly varying contributions to the decoherence parameters, primarily from the circuit coupling to the large loop.
dc.description16 pages, 20 figures; v2: minor revision
dc.identifierhttps://arxiv.org/abs/cond-mat/0510843
dc.identifierhttp://arxiv.org/abs/cond-mat/0510843
dc.identifierPhys. Rev. B 74, 014514 (2006).
dc.identifierdoi:10.1103/PhysRevB.74.014514
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/103124
dc.subjectMesoscale and Nanoscale Physics
dc.subjectSuperconductivity
dc.subjectQuantum Physics
dc.titleEfficient evaluation of decoherence rates in complex Josephson circuits
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