We propose a hybrid quantum system, where an LC resonator inductively interacts with a flux qubit and is capacitively coupled to a Rydberg atom. Varying the external magnetic flux bias controls the flux-qubit flipping and the flux qubit-resonator interface. The atomic spectrum is tuned via an electrostatic field, manipulating the qubit-state transition of atom and the atom-resonator coupling. Different types of entanglement of superconducting, photonic, and atomic qubits can be prepared via simply tuning the flux bias and electrostatic field, leading to the implementation of three-qubit Toffoli logic gate.
@article{arxiv.1706.09527,
title = {Superconducting Qubit-Resonator-Atom Hybrid System},
author = {Deshui Yu and Leong Chuan Kwek and Luigi Amico and Rainer Dumke},
journal= {arXiv preprint arXiv:1706.09527},
year = {2017}
}