These rapidly spinning neutron stars flash regular radio pulses, and in an upcoming issue of The Astrophysical Journal astronomers say that the timing of such pulses could provide a new understanding of the 4 million solar mass black hole at the center of the Milky Way.
When they did the experiment, they found almost exactly that behaviour — if the quantum top started out in an island of stability, its spin changed in a regularway, but if not, chaos ruled and its spin direction changed quickly and erratically.