Resonant quantum gates in circuit quantum electrodynamics
Géraldine Haack, Ferdinand Helmer, M. Mariantoni, Florian Marquardt, E. Solano · Physical Review B · 2010
We propose the implementation of fast resonant gates in circuit quantum electrodynamics for quantum information processing. We show how a suitable utilization of three-level superconducting qubits inside a resonator constitutes a key tool to perform diverse two-qubit resonant gates, improving the operation speed when compared to slower dispersive techniques. To illustrate the benefit of resonant two-qubit gates in circuit quantum electrodynamics, we consider the implementation of a two-dimensional cluster state in an array of $N\ifmmode\times\else\texttimes\fi{}N$ superconducting qubits by using resonant controlled-phase and one-qubit gates, where the generation time grows linearly with $N$. For $N=3$, and taking into account decoherence mechanisms, a fidelity over 60% for the generation of this cluster state is obtained.