Characterization of coherent impurity effects in solid state qubits

Details Characterization of coherent impurity effects in solid state qubits Characterization of coherent impurity effects in solid state qubits

2007-06-12

arxiv.org/abs/0706.1747v2

Phys. Rev. B 77, 041303(R), 2008

Physics

Condensed Matter

Statistical Mechanics

4 pages, 5 figures. Replaced with published version, minor changes

Scientific paper

10.1103/PhysRevB.77.041303

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.

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