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- W2161402015 abstract "We study dephasing of a superconducting qubit due to quasiparticle tunneling through a Josephson junction. While qubit decay due to tunneling processes is well understood within a golden rule approximation, pure dephasing due to BCS quasiparticles gives rise to a divergent golden rule rate. We calculate qubit dephasing due to quasiparticle tunneling beyond lowest-order approximation in coupling between qubit and quasiparticles. Summing up a certain class of diagrams, we show that qubit dephasing due to purely longitudinal coupling to quasiparticles leads to dephasing $ensuremath{sim}exp[ensuremath{-}x(t)]$ where $x(t)ensuremath{propto}{t}^{3/2}$ for short-time scales and $x(t)ensuremath{propto}tphantom{rule{0.16em}{0ex}}ln(t)$ for long-time scales." @default.
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- W2161402015 date "2015-05-07" @default.
- W2161402015 modified "2023-09-24" @default.
- W2161402015 title "Qubit dephasing due to quasiparticle tunneling" @default.
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- W2161402015 doi "https://doi.org/10.1103/physrevb.91.174504" @default.
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