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Decoherence and 1/f noise in Josephson qubits

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arxiv cond-mat/0201449 v2 pith:A3EIOMJL submitted 2002-01-24 cond-mat.mes-hall

E. Paladino , L. Faoro , G. Falci , Rosario Fazio This is my paper · ORCID
classification cond-mat.mes-hall
keywords chargesdecoherencedephasingenvironmentjosephsonmodelnoisequbits
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We propose and study a model of dephasing due to an environment of bistable fluctuators. We apply our analysis to decoherence of Josephson Qubits, induced by background charges present in the substrate, which are also responsible for the 1/f noise. The discrete nature of the environment leads to a number of new features which are mostly pronounced for slowly moving charges. Far away from degeneracy this model for the dephasing is solved exactly.

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    A single NV spin qubit and two-qubit coincidence or Bell-state echoes can isolate fourth-order magnetic noise cumulants, demonstrated on telegraph-noise and critical Ising models.

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