SCIENCE - Quantum inverted pendulum: Control scheme dynamically maintains unstable quantum system

A simple pendulum has two equilibrium points: hanging in the "down" position and perfectly inverted in the "up" position. While the "down" position is a stable equilibrium, the inverted position is definitely not stable. Any infinitesimal deviation from perfectly inverted is enough to cause the pendulum to eventually swing down. Read more at: http://phys.org/news/2013-08-quantum-inverted-pendulum-scheme-dynamically.html#jCp

http://phys.org/news/2013-08-quantum-inverted-pendulum-scheme-dynamica