Toolbox of resonant quantum gates in Circuit QED

Details Toolbox of resonant quantum gates in Circuit QED Toolbox of resonant quantum gates in Circuit QED

2009-08-25

arxiv.org/abs/0908.3673v3

Phys. Rev. B. 82, 024514 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages

Scientific paper

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 QED, we consider the implementation of a two-dimensional cluster state in an array of N x N superconducting qubits by using resonant controlled-phase (CPHASE) 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.

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