Affiliation: | 1. JILA, NIST and University of Colorado, Department of Physics, Boulder, CO 80309, USA;2. Joint Quantum Institute, NIST and University of Maryland, Department of Physics, College Park, MD 20742, USA;3. Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck, Austria;4. Institute for Theoretical Physics, University of Innsbruck, A-6020 Innsbruck, Austria;5. Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, CA 91125, USA;6. National Institute of Standards and Technology, Boulder, CO 80305, USA |