G. Romero, D. Ballester, Y. M. Wang, V. Scarani, E. Solano
We present a method of implementing ultrafast two-qubit gates valid for the
ultrastrong coupling (USC) and deep strong coupling (DSC) regimes of
light-matter interaction, considering state-of-the-art circuit quantum
electrodynamics (QED) technology. Our proposal includes a suitable qubit
architecture and is based on a four-step sequential displacement of an
intracavity mode, 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 the fidelity
above 99%.
View original:
http://arxiv.org/abs/1110.0223
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