Characterization of coherent impurity effects in solid state qubits
arXiv:0706.1747 · doi:10.1103/PhysRevB.77.041303
Abstract
We propose a characterisation of the effects of bistable coherent impurities in solid state qubits. We introduce an effective impurity description in terms of a tunable spin-boson environment and solve the dynamics for the qubit coherences. The dominant rate characterizing the asymptotic time limit is identified and signatures of non-Gaussian behavior of the quantum impurity at intermediate times are pointed out. An alternative perspective considering the qubit as a measurement device for the spin-boson impurity is proposed.
4 pages, 5 figures. Replaced with published version, minor changes
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