[1] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
[2] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA
[3] Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea
[4] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA
[5] Barcelona Inst Sci & Technol, ICFO Inst Ciencies Foton, Castelldefels 08860, Barcelona, Spain
[6] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA
[7] Raytheon BBN Technol, Quantum Engn & Comp Grp Cambridge, Cambridge, MA 02138 USA
[8] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, Tsukuba, Ibaraki, Japan
[9] Natl Inst Mat Sci, Res Ctr Funct Mat, Tsukuba, Ibaraki, Japan
[10] MIT, Res Lab Elect, 77 Massachusetts Ave, Cambridge, MA 02139 USA
[11] Syst & Technol Res, Arlington, VA USA