Fast quantum phase gate in a small-detuning circuit QED model
Chun-Wang Wu, Han Yang, Hongyi Li, Zhi-Jiao Deng, Ping‐Xing Chen, Cheng-Zu Li · Physical Review A · 2010
We propose a theoretical protocol for a quantum phase gate between two transmon qubits capacitively coupled to a superconducting transmission line resonator driven by a strong microwave field. Compared with previous protocols involving a dispersive regime, our protocol works at a small detuning, $\ensuremath{\Delta}~g$, and the nontrivial two-qubit gates can be realized in a short time, $~$$1/g$, where $g$ is the qubit-resonator coupling strength. Our analysis shows that the protocol is robust against the main decoherence sources and unavoidable parameter variations. Moreover, our protocol can be implemented using the current experimental design of circuit QED.