Two-qubit gate operations in superconducting circuits with strong coupling and weak anharmonicity

Details Two-qubit gate operations in superconducting circuits with strong coupling and weak anharmonicity Two-qubit gate operations in superconducting circuits with strong coupling and weak anharmonicity

2012-01-06

arxiv.org/abs/1201.1364v1

Physics

Quantum Physics

24 pages, 27 figures

Scientific paper

We investigate theoretically the implementation of two-qubit gates in a system of two coupled superconducting qubits. In particular, we analyze two-qubit gate operations under the condition that the coupling strength is comparable to or even larger than the anharmonicity of the qubits. By numerically solving the time-dependent Schr\"odinger equation, we obtain the dependence of the two-qubit gate fidelity on the system parameters in the case of direct and indirect qubit-qubit coupling. Our numerical results can be used to identify the "safe" parameter regime for experimentally implementing two-qubit gates with high fidelity in these systems.

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