Observation of Co-tunneling in Pairs of Coupled Flux Qubits
arXiv:1006.0028 · doi:10.1103/PhysRevB.82.060512
Abstract
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.
arXiv comment4 pages, 5 figures
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