We propose a method for switchable coupling between superconducting qubits using double resonance. The inter-qubit coupling is achieved by applying near-resonant oscillating fields to the two qubits. The deviation from resonance relaxes the criterion of strong driving fields while still allowing for a fully entangling two-qubit gate. This method avoids some of the shortcomings of previous proposals for switchable coupling. We discuss the possible application of our proposal to a pair of inductively coupled flux qubits, and we consider the extension to phase qubits.
@article{arxiv.cond-mat/0605685,
title = {Generalized switchable coupling for superconducting qubits using double resonance},
author = {S. Ashhab and Shigemasa Matsuo and Noriyuki Hatakenaka and Franco Nori},
journal= {arXiv preprint arXiv:cond-mat/0605685},
year = {2007}
}