Quantum field state measurement and reconstruction in a cavity by quantum nondemolition photon counting: 19th International Conference on Laser Spectroscopy
       
        
      
        
      158–168
      
        (2010)
          
    
         
    
    
        Quantum nondemolition photon (QND) counting in a high Q cavity is performed by using circular Rydberg atoms. The atoms behave as clocks …
      
    
      
      
      
      
        
  M. Brune, I. Dotsenko, S. Deleglise, C. Sayrin, X. Zhou, S. Gleyzes, C. Guerlin, S. Kuhr, J. M. Raimond, S. Haroche