At near-absolute-zero temperatures, atoms can be held in an optical lattice—formed by standing light waves, where the atoms sit in the troughs of the waves at low potential energy. At these temperatures, they lose most of their thermal fluctuations and begin to act like an ideal quantum system. Atoms held in an optical lattice can be used to simulate electrons trapped in a crystalline solid, so this quantum system can be helpful in studying important phenomena like quantum magnetism and high-temperature superconductivity. The atoms could also be used for quantum logic gates and registers (the working memory of quantum computers).Source and rest of the story: http://arstechnica.com/science/news/2011/12/how-cold-is-cold-enough-a-lot-colder-than-you-think.ars
This is intriguing, when I was a kid I thought Molecular circuits were just Sci Fi, now it is looking like quantum computers may be a reality in my lifetime.