Observation of Co-tunneling in Pairs of Coupled Flux Qubits
Lanting, T. · Harris, R. · Johansson, J. · Amin, M. H. S. · Berkley, A. J. · Gildert, S. · Johnson, M. W. · Bunyk, P. · Tolkacheva, E. · Ladizinsky, E. · Ladizinsky, N. · Oh, T. · Perminov, I. · Chapple, E. M. · Enderud, C. · Rich, C. · Wilson, B. · Thom, M. C. · Uchaikin, S. · Rose, G.
Original · EN
We report measurements of macroscopic resonant tunneling between the two lowest energy states of a pair of magnetically coupled rf-SQUID flux qubits. This technique provides a direct means of observing two-qubit dynamics and a probe of the environment coupled to the pair of qubits. Measurements of the tunneling rate as a function of qubit flux bias show a Gaussian line shape that is well matched to theoretical predictions. Moreover, the peak widths indicate that each qubit is coupled to a local environment whose fluctuations are uncorrelated with that of the other qubit.
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