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

doi:10.1103/PhysRevB.72.020503

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

DOI 10.1103/PhysRevB.72.020503 · Physical Review B

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Abstract

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.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
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