Direct Josephson coupling between superconducting flux qubits

A. Izmalkov; Alec Maassen van den Brink; A.M. Zagoskin; E. Il'ichev; H.-G. Meyer; M. Grajcar; S.H.W. van der Ploeg; S. Linzen; S. Uchaikin; Th. Wagner

arxiv: cond-mat/0501085 · v2 · submitted 2005-01-05 · ❄️ cond-mat.supr-con · cond-mat.mes-hall

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. Hubner , H.-G. Meyer

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Alec Maassen van den Brink S. Uchaikin A.M. Zagoskin

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classification ❄️ cond-mat.supr-con cond-mat.mes-hall

keywords couplingfluxjosephsonqubitssuperconductingallowingantiferromagneticcircuit

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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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Direct Josephson coupling between superconducting flux qubits

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