Low-frequency measurement of the tunneling amplitude in a flux qubit

Details Low-frequency measurement of the tunneling amplitude in a flux qubit Low-frequency measurement of the tunneling amplitude in a flux qubit

2003-03-31

arxiv.org/abs/cond-mat/0303657v3

Phys. Rev. B 69, 060501(R) (2004)

Physics

Condensed Matter

Superconductivity

REVTeX4, 3pp., 3 EPS figures. v2: new sample, textual clarifications. v3: minor polishing; final, to appear in PRB Rapids

Scientific paper

10.1103/PhysRevB.69.060501

We have observed signatures of resonant tunneling in an Al three-junction qubit, inductively coupled to a Nb LC tank circuit. The resonant properties of the tank oscillator are sensitive to the effective susceptibility (or inductance) of the qubit, which changes drastically as its flux states pass through degeneracy. The tunneling amplitude is estimated from the data. We find good agreement with the theoretical predictions in the regime of their validity.

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