Direct Josephson coupling between superconducting flux qubits


Grajcar, M. and Izmalkov, A. and Ploeg, S.H.W. van der and Linzen, S. and Ilíchev, E. and Wagner, Th. and Huebner, U. (2005) Direct Josephson coupling between superconducting flux qubits. Physical Review B: Condensed matter and materials physics, 72 (2). 020503. ISSN 1098-0121

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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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Copyright:© 2005 The American Physical Society
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