Engineered selection rules for tunable coupling in a superconducting quantum circuit
K. Harrabi, Fumiki Yoshihara, A. O. Niskanen, Yasunobu Nakamura, J. S. Tsai · Physical Review B · 2009
Engineering selection rules of transitions is a useful strategy for coupling and decoupling qubits in superconducting quantum circuits. Following this approach, we implement a tunable coupling scheme between two flux qubits. The qubits are coupled parametrically under microwave driving via the nonlinear inductance of a third qubit. The measured on-state coupling as well as the off-state residual coupling depends on the coupler bias and agrees quantitatively with a calculation of transition matrix elements of a three-qubit Hamiltonian.