Experimental realization of direct Josephson coupling between superconducting flux qubits

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  • 5 January 2005
Abstract
We demonstrated strong antiferromagnetic coupling between two persistent-current flux qubits based on a shared Josephson junction, and therefore not limited by small inductances of the qubit loops. The coupling sign and magnitude were measured by coupling the system to a high-quality superconducting tank circuit. The design modifications allowing to continuously tune the coupling strength are discussed.

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