Coupling superconducting flux qubits at optimal point via dynamic decoupling with the quantum bus

Details Coupling superconducting flux qubits at optimal point via dynamic decoupling with the quantum bus Coupling superconducting flux qubits at optimal point via dynamic decoupling with the quantum bus

2008-07-10

arxiv.org/abs/0807.1584v2

Phys. Rev. B, 79, 024502 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages; 6 figures

Scientific paper

10.1103/PhysRevB.79.024502

We propose a scheme with dc-control of finite bandwidth to implement two-qubit gate for superconducting flux qubits at the optimal point. We provide a detailed non-perturbative 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 non-perturbative coupling regime which enables rapid two-qubit operation. This scheme can be scaled up to multi-qubit coupling.

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