Models of environment and T_1 relaxation in Josephson Charge Qubits

Boris L. Altshuler; Joakim Bergli; Lara Faoro; Yuri M. Galperin

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Models of environment and T₁ relaxation in Josephson Charge Qubits

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arxiv cond-mat/0411425 v2 pith:4NVYQ5HB submitted 2004-11-16 cond-mat.mes-hall cond-mat.supr-con

Models of environment and T₁ relaxation in Josephson Charge Qubits

Lara Faoro , Joakim Bergli , Boris L. Altshuler , Yuri M. Galperin This is my paper

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keywords chargedependencemodelfluctuatorjosephsonmodelsnoisepair

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A theoretical interpretation of the recent experiments of Astafiev et. al. on the T_1-relaxation rate in Josephson Charge Qubits is proposed. The experimentally observed reproducible nonmonotonic dependence of T_1 on the splitting E_J of the qubit levels suggests further specification of the previously proposed models of the background charge noise. From our point of view the most promising is the ``Andreev fluctuator'' model of the noise. In this model the fluctuator is a Cooper pair that tunnels from a superconductor and occupies a pair of localized electronic states. Within this model one can naturally explain both the average linear T_1(E_J) dependence and the irregular fluctuations. The role of fluctuators in the formation of strong resonant peaks in this dependence is also discussed.

Models of environment and T₁ relaxation in Josephson Charge Qubits

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