Violation of a Leggett-Garg inequality with ideal non-invasive measurements

George C. Knee^*, Stephanie Simmons, Erik M. Gauger, John J. L. Morton, Helge Riemann, Nikolai V. Abrosimov, Peter Becker, Hans-Joachim Pohl, Kohei M. Itoh, Mike L. W. Thewalt, G. Andrew D. Briggs, Simon C. Benjamin