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