Andrew and Erna Viterby Department of Electrical Engineering and Russell Berrie Nanotechnology Institute Technion-Israel Institute of Technology Haifa 32000 Israel;
Department of Physics Massachusetts Institute of Technology Cambridge MA USA;
Andrew and Erna Viterby Department of Electrical Engineering and Russell Berrie Nanotechnology Institute Technion-Israel Institute of Technology Haifa 32000 Israel;
Andrew and Erna Viterby Department of Electrical Engineering and Russell Berrie Nanotechnology Institute Technion-Israel Institute of Technology Haifa 32000 Israel;