Centre for Biomedical Engineering (CBME) and Department of Electrical & Electronic Engineering, The University of Adelaide, SA 5005, Australia;Department of Mathematics and Michigan Center for Theoretical Physics University of Michigan, Ann Arbor, MI 48109-1109 USA;Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, USA;Chemical Physics Theory Group, Department of Chemistry, and Center for Quantum Information and Quantum Control, University of Toronto, 80 St. George St., Toronto, Ontario, M5S 3H6, Canada;U.S. Army Research Laboratory, 2800 Powder Mill Rd., Adelphi, MD 20783, USA;Centre for Quantum Computer Technology, School of Physics. The University of New South Wales, Sydney, NSW 2052, Australia;Department of Electrical Engineering, Arizona State University, Tempe, AZ 85287-5706, USA;Department of Physics, University of Arkansas, Fayetteville, AR 72701, USA;Laboratory of Physical and Structural Biology, NICHD, National Institutes of Health, Bethesda, MD 20892-0924, USA;Department of Electrical Engineering, Texas A&M University, College Station, TX 77843-3128, USA