We present an experimentally implementable method to couple Josephson charge qubits and to generate and detect macroscopic entangled states. A large-junction superconducting quantum interference device is used in the qubit circuit for both coupling qubits and implementing the readout. Also, we explicitly show how to achieve a microwave-assisted macroscopic entanglement in the coupled-qubit system.
@article{arxiv.cond-mat/0306363,
title = {Controllable manipulation and entanglement of macroscopic quantum states in coupled charge qubits},
author = {J. Q. You and J. S. Tsai and Franco Nori},
journal= {arXiv preprint arXiv:cond-mat/0306363},
year = {2009}
}