Direct Josephson coupling between superconducting flux qubits

M. Grajcar, A. Izmalkov, S. H W Van Der Ploeg, S. Linzen, E. Il'ichev, Th Wagner, U. Hübner, H. G. Meyer, Alec Maassen Van Den Brink, S. Uchaikin, A. M. Zagoskin

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


We have demonstrated strong antiferromagnetic coupling between two three-junction flux qubits based on a shared Josephson junction, and therefore not limited by the small inductances of the qubit loops. The coupling sign and magnitude were measured by coupling the system to a high-quality superconducting tank circuit. Design modifications allowing to continuously tune the coupling strength and/or make the coupling ferromagnetic are discussed.

Original languageEnglish
Article number020503
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number2
Publication statusPublished - 1 Jul 2005

ASJC Scopus subject areas

  • Condensed Matter Physics

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