Low-frequency measurement of the tunneling amplitude in a flux qubit
M. Grajcar, A. Izmalkov, E. Il'ichev, Th. Wagner, N. Oukhanski, U., Huebner, T. May, I. Zhilyaev, H.E. Hoenig, Ya.S. Greenberg, V.I. Shnyrkov, D., Born, W. Krech, H.-G. Meyer, Alec Maassen van den Brink, and M.H.S. Amin
TL;DR
This paper reports on the measurement of tunneling amplitudes in a flux qubit using resonant properties of an inductively coupled tank circuit, confirming theoretical predictions.
Contribution
It introduces a low-frequency measurement technique for tunneling amplitudes in flux qubits, demonstrating agreement with theoretical models.
Findings
Resonant tunneling signatures observed in an Al three-junction flux qubit.
Tunneling amplitude estimated from tank circuit data.
Good agreement with theoretical predictions.
Abstract
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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