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.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 1 Jul 2005|
ASJC Scopus subject areas
- Condensed Matter Physics