'A gem and a must-read for any student of quantum physics, from advanced undergraduate to expert.' Physics Today, August 2007`This is a wonderfully well-informed book. The authors tackle a difficult subject with beautiful clarity, and elegance. It should be required reading for anyone who wishes to explore the quantum wonders of Nature.' A. Ekert, University of Cambridge Biografía del autor Serge Haroche Professor, Collège de France Laboratoire Kastler-Brossel, départment de physique de l'Ecole normale supérieure, 24 rue Lhomond, 75005 Paris Professor at Collège de France (Chaire de Physique Quantique) since 2001 Member of the French Academy of Sciences since 1993 Professor at Université Pierre et Marie Curie (1975-2000) and at Ecole Normale Supérieure (1984-2000). Maître de Conférence at Ecole Polytechnique (1975-1984) Professor (part time) at Yale University (1984-1993) Senior Member of Institut Universitaire de France (1991-2000) Fellow of the Americal Physical Society (1990) Prix Ricard of French Physical Society (1983) Michelson Medal of Franklin Insitute (1993) Quantum Electronics Prize of the European Physical Society (2002) Jean-Michel Raimond Professor, Université Pierre et Marie Curie et Institut Universitaire de France Laboratoire Kastler-Brossel, départment de physique de l'Ecole normale supérieure, 24 rue Lhomond, 75005 Paris Professor at Université Pierre et Marie Curie since 1988 Junior member of Institut Universitaire de France, 1994-1999 Senior member of Institut Universitaire de France, Quantum Optics chair, 2001- Ampère Prize of the French Academy of Sciences with M. Brune, 1998 Chargé de recherches CNRS 1983-1988 Attaché de recherches CNRS 1979-1983