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Bulletin of the American Physical Society

Two-qubit gates and coupling with low-impedance flux qubits

Jerry M. Chow, Antonio D. Corcoles, Chad T. Rigetti, Jim Rozen, George Keefe, Mary-Beth Rothwell, John Rohrs, Mark Borstelmann, David Peter Divincenzo, M. B. Ketchen, Matthias Steffen

Published Mar 21, 2011• 0 citations
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The interaction of flux qubits with a low-frequency tank circuit is studied. It is shown that changes in the state of the interacting qubits influence the effective inductance and resistance of the circuit, which is the essence of the so-called impedance measurement technique. The multiphoton resonant excitations in both single flux qubits and pairs of coupled flux qubits are investigated. In particular, we compare our theoretical results with recent spectroscopy measurements, Landau-Zener interferometry, and the multiphoton fringes.