Direct Josephson coupling between superconducting flux qubits

Details Direct Josephson coupling between superconducting flux qubits Direct Josephson coupling between superconducting flux qubits

2005-01-05

arxiv.org/abs/cond-mat/0501085v2

Phys. Rev. B 72, 020503(R) (2005)

Physics

Condensed Matter

Superconductivity

REVTeX 4, 4 pages, 5 figures; v2: completely rewritten, added finite-temperature results and proposals for ferromagnetic galva

Scientific paper

10.1103/PhysRevB.72.020503

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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