Quantum two level systems and Kondo-like traps as possible sources of decoherence in superconducting qubits

Details Quantum two level systems and Kondo-like traps as possible sources of decoherence in superconducting qubits Quantum two level systems and Kondo-like traps as possible sources of decoherence in superconducting qubits

2005-10-20

arxiv.org/abs/cond-mat/0510554v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, no figures

Scientific paper

10.1103/PhysRevLett.96.047001

We discuss the origin of decoherence in Josephson junction qubits. We find
that two level systems in the surrounding insulator cannot be the dominant
source of noise in small qubits. We argue that electron traps in the Josephson
barrier with large Coulomb repulsion would give noise that agrees both in
magnitude and in temperature dependence with experimental data.

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