Engineered selection rules for tunable coupling in a superconducting quantum circuit

K Harrabi, F Yoshihara, AO Niskanen, Y Nakamura… - Physical Review B …, 2009 - APS
K Harrabi, F Yoshihara, AO Niskanen, Y Nakamura, JS Tsai
Physical Review B—Condensed Matter and Materials Physics, 2009APS
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 …
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.
American Physical Society
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