Ultrafast Quantum Gates in Circuit QED

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G. Romero, D. Ballester, Y. M. Wang, V. Scarani, and E. Solano


Phys. Rev. Lett. 108, 120501 (2012)

We present a method to implement ultrafast two-qubit gates valid for the ultrastrong coupling and deep strong coupling regimes of light-matter interaction, considering state-of-the-art circuit quantum electrodynamics technology. Our proposal includes a suitable qubit architecture and is based on a four-step sequential displacement of the intracavity field, operating at a time proportional to the inverse of the resonator frequency. Through ab initio calculations, we show that these quantum gates can be performed at subnanosecond time scales while keeping a fidelity above 99%.