2003/03/31 by M. Grajcar, A. Izmalkov, E. Il'ichev +13
Physics and Astronomy · #cond-mat.supr-con #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevb.69.060501
published as Phys. Rev. B 69, 060501(R) (2004) · REVTeX4, 3pp., 3 EPS figures. v2: new sample, textual clarifications. v3: minor polishing; final, to appear in PRB Rapids
arxiv created 2004/01/12 · arxiv updated 2009/11/30
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.