Experimental investigation of an eight-qubit unit cell in a superconducting optimization processor

R. Harris, M. W. Johnson, T. Lanting, A. J. Berkley, J. Johansson, P. Bunyk, E. Tolkacheva, E. Ladizinsky, N. Ladizinsky, T. Oh, F. Cioata, I. Perminov, P. Spear, C. Enderud, C. Rich, S. Uchaikin, M. C. Thom, E. M. Chapple, J. Wang, B. WilsonM. H S Amin, N. Dickson, K. Karimi, B. MacReady, C. J S Truncik, G. Rose

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137 Citations (Scopus)


A superconducting chip containing a regular array of flux qubits, tunable interqubit inductive couplers, an XY-addressable readout system, on-chip programmable magnetic memory, and a sparse network of analog control lines has been studied. The architecture of the chip and the infrastructure used to control it were designed to facilitate the implementation of an adiabatic quantum optimization algorithm. The performance of an eight-qubit unit cell on this chip has been characterized by measuring its success in solving a large set of random Ising spin-glass problem instances as a function of temperature. The experimental data are consistent with the predictions of a quantum mechanical model of an eight-qubit system coupled to a thermal environment. These results highlight many of the key practical challenges that we have overcome and those that lie ahead in the quest to realize a functional large-scale adiabatic quantum information processor.

Original languageEnglish
Article number024511
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number2
Publication statusPublished - 15 Jul 2010
Externally publishedYes


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Harris, R., Johnson, M. W., Lanting, T., Berkley, A. J., Johansson, J., Bunyk, P., Tolkacheva, E., Ladizinsky, E., Ladizinsky, N., Oh, T., Cioata, F., Perminov, I., Spear, P., Enderud, C., Rich, C., Uchaikin, S., Thom, M. C., Chapple, E. M., Wang, J., ... Rose, G. (2010). Experimental investigation of an eight-qubit unit cell in a superconducting optimization processor. Physical Review B - Condensed Matter and Materials Physics, 82(2), [024511]. https://doi.org/10.1103/PhysRevB.82.024511