Coupling superconducting flux qubits at optimal point via dynamic decoupling with the quantum bus
Ying-Dan Wang, A. Kemp, K. Semba
DOI 10.1103/PhysRevB.79.024502 · Physical Review B
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Abstract
We propose a scheme with dc control of finite bandwidth to implement a two-qubit gate for superconducting flux qubits at the optimal point. We provide a detailed nonperturbative analysis on the dynamic evolution of the qubits interacting with a common quantum bus. An effective qubit-qubit coupling is induced while decoupling the quantum bus with proposed pulse sequences. The two-qubit gate is insensitive to the initial state of the quantum bus and applicable to nonperturbative coupling regime which enables rapid two-qubit operation. This scheme can be scaled up to multiqubit coupling.
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