1. T. Fujisawa, Department of Applied Physics and DIMES, Delft University of Technology, 2600 GA Delft, Netherlands, and NTT Basic Research Laboratories, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa, 243-0198, Japan. T. H. Oosterkamp, W. G. van der Wiel, B. W. Broer, R. Aguado, L. P. Kouwenhoven, Department of Applied Physics and DIMES, Delft University of Technology, 2600 GA Delft, Netherlands. S. Tarucha, NTT Basic Research Laboratories, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa, 243-0198, Japan, and...