We have probed the current-phase relation of an atomic contact placed with a tunnel junction in a small superconducting loop. The measurements are in quantitative agreement with the predictions of a resistively shunted SQUID model in which the Josephson coupling of the contact is calculated using the independently determined transmissions of its conduction channels.
@article{arxiv.0708.0515,
title = {Measurement of the current-phase relation of superconducting atomic contacts},
author = {M. L. Della Rocca and M. Chauvin and B. Huard and H. Pothier and D. Esteve and C. Urbina},
journal= {arXiv preprint arXiv:0708.0515},
year = {2011}
}