I believe this was posted to HN recently: http://phys.org/news/2013-10-quantum-trajectory-superconducting-bit.html http://phys.org/news/2013-10-quantum-traject

I believe this was posted to HN recently: http://phys.org/news/2013-10-quantum-trajectory-superconducting-bit.html http://phys.org/news/2013-10-quantum-trajectory-superconduct... Or something similar to it. There are few techniques to observe quantum state.