Four-qubit device with mixed couplings

M. Grajcar, A. Izmalkov, S. H W Van Der Ploeg, S. Linzen, T. Plecenik, Th Wagner, U. Hübner, E. Il'ichev, H. G. Meyer, A. Yu Smirnov, Peter J. Love, Alec Maassen Van Den Brink, M. H S Amin, S. Uchaikin, A. M. Zagoskin

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71 Citations (Scopus)


We present the first experimental results on a device with more than two superconducting qubits. The circuit consists of four three-junction flux qubits, with simultaneous ferro- and antiferromagnetic coupling implemented using shared Josephson junctions. Its response, which is dominated by the ground state, is characterized using low-frequency impedance measurement with a superconducting tank circuit coupled to the qubits. The results are found to be in excellent agreement with the quantum-mechanical predictions.

Original languageEnglish
JournalPhysical Review Letters
Issue number4
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Grajcar, M., Izmalkov, A., Van Der Ploeg, S. H. W., Linzen, S., Plecenik, T., Wagner, T., Hübner, U., Il'ichev, E., Meyer, H. G., Smirnov, A. Y., Love, P. J., Maassen Van Den Brink, A., Amin, M. H. S., Uchaikin, S., & Zagoskin, A. M. (2006). Four-qubit device with mixed couplings. Physical Review Letters, 96(4).