Quantum communication relies on the efficient generation of entanglement between remote quantum nodes, due to entanglement's key role in achieving and verifying secure communications. Remote entanglement has been realized using a number of different probabilistic schemes, but deterministic remote entanglement has only recently been demonstrated, using a variety of superconducting circuit approaches. However, the deterministic violation of a Bell inequality, a strong measure of quantum correlation, has not to date been demonstrated in a superconducting quantum communication architecture, in part because achieving sufficiently strong correlation requires fast and accurate control of the emission and capture of the entangling photons. Here we present a simple and robust architecture for achieving this benchmark result in a superconducting system.
@article{arxiv.1808.03000,
title = {Violating Bell's inequality with remotely-connected superconducting qubits},
author = {Y. P. Zhong and H. -S. Chang and K. J. Satzinger and M. -H. Chou and A. Bienfait and C. R. Conner and É. Dumur and J. Grebel and G. A. Peairs and R. G. Povey and D. I. Schuster and A. N. Cleland},
journal= {arXiv preprint arXiv:1808.03000},
year = {2019}
}