Cotunneling in pairs of coupled flux qubits

T. Lanting, R. Harris, J. Johansson, M. H S Amin, A. J. Berkley, S. Gildert, M. W. Johnson, P. Bunyk, E. Tolkacheva, E. Ladizinsky, N. Ladizinsky, T. Oh, I. Perminov, E. M. Chapple, C. Enderud, C. Rich, B. Wilson, M. C. Thom, S. Uchaikin, G. Rose

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Abstract

We report measurements of macroscopic resonant tunneling between the two lowest energy states of a pair of magnetically coupled rf-superconducting quantum interference device flux qubits. This technique provides both a direct means of measuring the energy gap of the two-qubit system and a method for probing 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.

Original languageEnglish
Article number060512
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number6
DOIs
Publication statusPublished - 23 Aug 2010

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ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Lanting, T., Harris, R., Johansson, J., Amin, M. H. S., Berkley, A. J., Gildert, S., ... Rose, G. (2010). Cotunneling in pairs of coupled flux qubits. Physical Review B - Condensed Matter and Materials Physics, 82(6), [060512]. https://doi.org/10.1103/PhysRevB.82.060512