| Institution: | (1) Heriot-Watt University, EH14 4AS Edinburgh, Scotland;(2) Physics Department, Heriot-Watt University, EH14 4AS Edinburgh, Scotland, UK;(3) Institut für Quantenoptik, Universität Hannover, D-3000 Hannover, Fed. Rep. Germany;(4) Institut für Angewandte Physik, Universität Hannover, D-3000 Hannover, Fed. Rep. Germany;(5) Optisches Institut, Technische Universität, D-1000 Berlin 12, Fed. Rep. Germany;(6) Bell Telephone Laboratories, 07733 Holmdel, NJ, USA;(7) Institute of Physics of the Byelorussian Academy of Sciences, Minsk, USSR;(8) Department of Electrónica Cuántica, Universidad Politecnica Madrid, Madrid-3, Spain;(9) Bell Laboratories, 07733 Holmdel, NJ, USA;(10) California Institute of Technology, 91125 Pasadena, CA, USA;(11) Department of Physics and Astronomy, Wayne State University, 48202 Detroit, MI, USA |
