THIS TALK HAS BEEN CANCELLED: Monday, May 7, 2007 4:15 p.m. Harvard University Morris Loeb Lectures in Physics Jefferson Physical Lab, Rm. 250 Colloquium: "Quantum Crystals, Quantum Choreography and Quantum Computing" Matthew P.A. Fisher Kavli Institute, UCSB Tea in Jefferson 450 at 3:30 p.m.